Ôn tập chương III
Hướng dẫn giải Bài 94 (Trang 105 SGK Toán 9 Hình học, Tập 2)
<p>H&atilde;y xem biểu đồ h&igrave;nh quạt biểu diễn sự ph&acirc;n phối học sinh của một trường THCS theo diện ngoại tr&uacute;, b&aacute;n tr&uacute;, nội tr&uacute; (h.72). H&atilde;y trả lời c&aacute;c c&acirc;u hỏi sau :</p> <p>a) C&oacute; phải&nbsp;<math xmlns="http://www.w3.org/1998/Math/MathML"><mfrac><mn>1</mn><mn>2</mn></mfrac></math>số học sinh&nbsp;l&agrave; học sinh ngoại tr&uacute; kh&ocirc;ng ?<img class="wscnph" 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" width="179" height="125" /></p> <p>b) C&oacute; phải&nbsp;<math xmlns="http://www.w3.org/1998/Math/MathML"><mfrac><mn>1</mn><mn>3</mn></mfrac></math>số học sinh l&agrave; học sinh b&aacute;n tr&uacute; kh&ocirc;ng ?</p> <p>c) Số học sinh nội tr&uacute; chiếm bao nhi&ecirc;u phần trăm ?</p> <p>d) T&iacute;nh số học sinh mỗi loại, biết tổng số học sinh l&agrave; 1800 em.</p> <p><strong>Giải :</strong></p> <p>Đo đạc ta được:&nbsp;<math xmlns="http://www.w3.org/1998/Math/MathML"><mover><msub><mi>O</mi><mn>1</mn></msub><mo>^</mo></mover></math>=<math xmlns="http://www.w3.org/1998/Math/MathML"><mn>30</mn><mo>&#176;</mo><mo>;</mo><mover><msub><mi>O</mi><mn>3</mn></msub><mo>^</mo></mover><mo>=</mo><mn>60</mn><mo>&#176;</mo></math></p> <p>a) Ta c&oacute;:&nbsp;<math xmlns="http://www.w3.org/1998/Math/MathML"><mover><msub><mi>O</mi><mn>2</mn></msub><mo>^</mo></mover><mo>=</mo><mfrac><mn>1</mn><mn>2</mn></mfrac><mover><mi>O</mi><mo>^</mo></mover></math></p> <p>n&ecirc;n c&oacute;&nbsp;<math xmlns="http://www.w3.org/1998/Math/MathML"><mfrac><mn>1</mn><mn>2</mn></mfrac></math>số học sinh l&agrave; học sinh ngoại tr&uacute;.</p> <p>b) Ta c&oacute;:&nbsp;<math xmlns="http://www.w3.org/1998/Math/MathML"><mover><msub><mi>O</mi><mn>3</mn></msub><mo>^</mo></mover><mo>=</mo><mfrac><mn>1</mn><mn>2</mn></mfrac><mover><mi>O</mi><mo>^</mo></mover></math></p> <p>n&ecirc;n c&oacute;&nbsp;<math xmlns="http://www.w3.org/1998/Math/MathML"><mfrac><mn>1</mn><mn>3</mn></mfrac></math>số học sinh l&agrave; học sinh b&aacute;n tr&uacute;.<img class="wscnph" 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z+NOTrKxjPKOMx23rzZkuFTMyMo9qLlAWdevEcV47h5bX8iwDrut0UE0pSgUpSgUpSgUpSgwzlnLOQcOxB67cYcVv8g5B6zTTFmReItrQUqPzuuSZB7UJSkHQSlaiopHaElS05kDsbqFICvqR/A1IGvFBNKUoFKUoFdebOi26K/OnymY0aM2p1555YQhtCRtSlE+AB9TX2UoggAfXValdQc3JepnllXSRiMHtw2y/Z9z5PvbcxTK2o7ii41amu3z6ryEBStgp9NevYkgPjx/jMfrO5TZ595FxWfG49wSa7F49tExYXGvL6VEOXp5CXFJX8ye1kBIT2gK7lnQTt0EJ0NeNDQ0fArp2i026wWmFY7PETHgW6M3EisAkpbYbSEoQCdk6SAPPnxXeHtQANDQqaUoFKUoKu6kOE7dz7xVc8Ffny7bc21IuNiuUWa5Fcg3Vnaor/qIBOkrPn5VeCSB3AEdLpc5gl8x8RW683+MIOV2V5yw5TblILbkK7RT6b6FNqWtxsKIDiA4e8tuIUQN6q3SkE7NawXjG5vAHVvE5Lh3NyLx1zIGsfvNvbWkR4mWq/2KapsJ+USEMqjlaTtT7yO8nuRoNnwdipqE+wqaDycqxLF85sMvFs0x63X2zTwgSrfcYqJEZ8JWFpC21gpUApKVDYPkA/Sukjj7BGJtjuLOG2REvGIqoNkfTBaDlsjqQEFqOrt2ygpSlPajQ0APbxWR1xIHd7/yoNcss6cbnkefZXl2eYDxvzBHuoS7j7OYMpiLx9CEpSm3tahywplW3HFPjtV39oLavxi0+IuOonH3H0fEV4zjtmaMmXNctNk9ZdviKkSFvllovaK0pLnb3BDSTraWmkkNpygX2z/bhxoXBn7UTETOMQnSxHKygOa17dwI/lXo737CgxfCeKOMeNxLHH3H2O42Lh2CX9lW1mL8R2AhHqemkd2u5Wt+3cfzrDbZwbx5aOSLmu2cE4BEsNzsbiJVzYskVEuVKfeUJMdzXlbS2+xSgUaUSdqPsLDk5TAt9gmZHcY02JFg+uXUOx1B0htxSNpQNkhRTtJH4kqSfrXHD8glZVjcDIJ2O3GxPzUFxVuuCQiSwAogBaQflJACtfkRug8zNOIeKuSWLbG5C43xnJWbP3fZzd3tTEtMTuCQr0g6lQRsIQDrX4R+VZLbLZbrLbYlms8GPCgQGERosaO2G2mGUJCUNoSnQSlKQAAPAAArsp8DVTQKUpQKgpB81NKCnuonhS68oW/HcswG8xrHyLx/dW77i9yfQr0XnEgpet0tbenvgZSCW3ktqHshRCwgoV7PBPNVp5uw6RfYtnlWW72S5SbDkVllLS47a7rGV2yI/qp+R9AUdpdQSlaSDoHuSmxynf1rV7nhhzp05ctfU/YG1qsOROwsY5AhAaaEUrIjXNKEaKn2llKFKUFH0zruSE+Q2hB2N1NfNh5qQw2/HcQ404kLQtCgUqSRsEEeCCK+lB02rmy9cZNsQ1JDsVtpxa1xnEtKDhVoIcICFkdh2EklO0713DfbHkfT+VO0ef31NApSlApSlApSlApSlB05ci5NTIbUSC08w64tMl1T/YphAbUUqSntPeSsJTrY0FE+daPbB2Af+lQpIV70JUDoa/nQV3z5zPY+BONbjyDd7XLvEht1iDa7LBIMy73GQ4Go8OOg+VrWtQJCApQSlau1XaQer098TyeLePmWcmXFmZtkDzl7y+6MISPjbtJUXH9KAG2myr0mhoANNoGhVf5Pco/NnVzZeMV2xUzGuFobeYXdawyWVZJKSW7U0tt5orV6MZcuSlxleg6tnuKVNpCtjkfhHgD+FBRPWpm/IPFfT7lHKnG+WfY90xSMJgbXAZlNy+5xDYQsOJPaB3k/Lo71/CrUxHMLNkEZu2s362Sr1CgQ5N0hMSW1PxC+0Ftl1pJ7mwsBRT3AAgeNiqX/AEhwLnRlym2hJUr7Ja0ANk7kte1epy9CuX9H/FjuO5He7Ne05liBbjWiUWHLwwJTKZ0N9AHc/HTAM2Q43saTFK1bS2oELC5J5Kg4PGi2uFLssjK74r4awWaddmYS7hIKkp+X1D3qbQpaCstpWoA+Ek6ByeyvXZ2zQHb6zFaua4zSprcZZUyh8oHqBsnyUhWwCfcVqnmTX64jqIvvEdvh5Zcn3GMbvjueXxo4/AMO3KUtq3MxWnnyG1SPvWnvRCnludqx2qFRzjksa4/o3V5FjOXx4esQsi497jSVqRFcQ5FSXgtgKX92tKtlAKtoOgT4oNsU3OA5cHbQ3OjLnsMtyXYwdHrNtOKWlDike4SpTbgBPglCtfhNdpJCh3D2PtVHchRbSrNOnW9zPhJF0byiRGauDg+/Wy7jN2U4lK1gL7XFtsqKT7qSjY2BV4I/CKDlWHcucb2Pl/jjIONsgcdZiX2IpgSWTp6I+CFsSWj7B1p5DbqD9FtpP0rMagpBO6CjekXlPI884ycxPkV1P9InHc1zFMrbUo9z8uPoNTR3H1FNyWux5LqkpCyVlI7QKvIHY2a1m59y13p55zw/naVDk/qTlEb9Tc1fjolSVRllffbJi2UK9JCG3FvtqdIK9SO0BWx27MNrS42laTsKGwd73/woOVQUg1NKDTKw4vFldf3Lc6755ktst9jxKw3Ylu+OR47aCtxTiHPISGNIJKSQn3J/Os4yaDyZmvVDl3G1jz3I7Tg144vhXZy4W2agOWi9ruLrUR2IVbKO9mM+pSAC2v0/n0SN2ZfuELZdOThyzYsyv2L3mRBYtl1Rao1tU1d4rLpcQ3J+KiPOEDuUnba0KCToEHzXXtvBS7fzZI5vXy7ncqZKt/2Q7YnXLcm0LgpcedYZU03ES6r0XH3FNuqdLo7ikrUlS0qCtcDyPOLN1oy+HrjnV4vdhsnEFrmBE9wEybgmcphc1wAAes4lPzEeDs+K7PSpleW3jkrnzGciyu7XiDi2bJg2hFwkqfVEjKjIcLSSob7e5R/PW6t6TxTjz3LUHmWLKlwb7Fsz1hlJjNRw1coa3EuoRIUpovH0nEdzfY4jRUsEKCiK6vG3CWD8UXzL79iAuofze5pu91E64uzNyg32FaFvFTg7gBsFRA0AkJAAoM9TvXmppSgUpSgUriVEHQFVZn3Ujxzg9/Rg0Fdxy/NXkoWziuMRvjrmUKUlPqOpBDcZsd4JdkONt6Cvm2NUFpKUQSBon8qoHqN58xG12678MYtjU/kXO7/AkQU4zY225K4hcaAQ5cFk9kNolxvSndb2NAg7rzrzxBzZ1Ix46efMlXx9hSj6y8Dwy6OqmXFtbTKVR7vdk9odZIMttcaK2hBDqVeu4pCSLk454x454rxyNjfGWJ2uxWltKVJRCaALyghKfVcc8qdWpKE9zi1KUrW1EnzQUb0EcmZxe+KlcRcx2uVaOReNi1abtCmqT6zkUp3GkDS1eolSNJ70/JtOkk6rZ8b+ta684tXTAOcOPefLNenE2JTv6kZlGBedZbiSlkw5BaZT4WiUUNl11XY2l/8AD5KhsSkgpBBGj+VBypSlApSlApSlApSlApSlAry8mv8AbsVx+55Pd3HEQLRDfnylISVKDLLZcXofU9qSdfXVepVCdY2QX1njq08dYp6bt15GyCDjKo7cwMSnLe6vunKZJUkkpjpXv30lR/dQfDokTfr3wk3yplrTX29yVdJuVy323lrDzMhw/B6StSvTCYiY6A2NBITrW91sCPaunZrTbrFaYVltEZuNBgMIjRmmwAlDaEhKQNfTQFdwDQ1Qda4Wy3XaKqFdIMeZHWpC1MyGkuIKkKCkK7VAjYUlKgfoQD7ivMbwjGUZFIytdvW/c33GXg5IkOvojuNNOMpcYaWotx1+m86hSmkpKgtQUVbr21K0dDW/fVeY1k1mkZFLxJiehV3gwo1xfjditojSFvIZc2QAQpcZ8aBJ+Q71sUGNz+EOK7nmFyzqfh0V673qImDdVKcc+HubKUKQlMqN3ehJKULUkKdQpQB0CNDS3cIcV2rDW+O4mHxTi7Utc1Nnecceh+opSlFJacUUlruUSGiPTB1pI0KzfuPjQ9/NedfsitGMWiTfr9OahQIaAt55zZ1s6SlIA2paiQlKACpSlAAEkAh4WYcRcbZ/Ktk7MMQgXKTZY8iNa3nElLlvS+WitcdSSCy6Cw0UuoKXEFG0KSd1mFdGzXNV3tUW6Lt0uAqUyl4xZaEpfZ7hvtcSkkBQ+oBNdsrI9xr9/wBP40HOlQCSNkaqaDwM6wrHeR8QvOB5dAMyzX+I5BnMBxSC40tOlAKSQUn8iPyqn+l7PbrFdyDpzzILGS8XKZhNSHVgqudnWD8FLACU6HYA2flAKkEir+KQTutfOorGP6P8tsHVVjzEpU3EUC25PHjhShMx95f37im0NrK1sKKXgQNhCXBsUGwaSSASNbqa6FkvlnySzwr/AI9c4txtlxYRKiS4zocaeaWNpWhQ8KSQfcV8clyazYhY5mS5FORCttvb9WS+tKlBtGwNkJBOtn8qD1aVgl45EvWJT50vNsUZt+NNzosCHdotx+KccU+4G0Lfj+mgsp9RTaPlU4drT4A2RnSSSAT70E0pSgUrgVEKA8ef31XfI/PWDcbXm2YlJVMvuWXl1tuBjNkS3Iuj6Vd23SypaA2ykIWS64pKNJOiT4oLFKtGqq5O6kME45yBGARG52U55JiLlw8TsTJkXB5AacWlawPlZbPpFPqLIAKkb/EK8ZnGOdOW03y2cpSIGD4lMUpiJb8cmLXdJsJxvRRLlEAR1gn2Y/NQ7yKz7jriPAOLbNCs+H2FpgwowiCc+S/NfQCCfWkr244SQCe5R8gfkKCqFYb1GcyqujvKV3c45xlp9xuHjmLXBC7ndGAlfaqRcfaP3dzYKGR3AoV94ARXS6csq41iW3kuBxt0/LxO/cdS3LTdoDHwz8+6yEMGSlv4tKlKfUor0C6s/Mre62TIHkHf8vrVGcJ8SZvxdmnN+Xz2bZNGdZOb7Y4zMtQK20xUtpbeUUaaJWgjYC9A7/dQepK6g4L/ABZx9n1rwS93Odye9Ah2WwNKbTJ9aTGckrS64ohttLMdmQ4tROgGVD3IFZtjc/DsVmwOILCwq3CyWNhdthlKvTFvZ7WAGlqJKw390lWySO9G9kmq5xfh7L7NxzwVaZarcbvxjMhSrlGbfUWXwbRMtr4ad7Qdtiep5O0jv9Ht+Tv7k+7YbNlORc6T+Sn5Nh/VW02N/HLOqBLVKkS33JbS5a3iNIa9JyL6PpjuPcF7I12gMbj8eca89cW8p4I/gqccGU3m52q/7Uh55+4NFITMUttfz9pDS0pKtDtCfA8VnXBGfscm8RYvmUdlDLsyAhuXHSVkxpbRLUhg94Se5t1DiDse6TXz4dxXJsYgZMrKokKLKvWT3K8MsxJapCW47yx6YKyhHzdqdka0CdedbrzuMB+rnKHJ+Aq+7aVPg5dbo7fllmHcmVNuefo4u4QLm8pOtffJUCe4pSFpg7qahJBSCPapoFKUoFKUoIrpwxdG5M03GZEfZW8FwkMRlNqZY9NAKHFFxXqr9QOK7glA7VoT2koK19yoUkKHk/voJB2NmpqB4qaBWuHN0teW9VPCXGcW73SAbMLnm0tKGu+HNaYa+HbZc04nSwt5SgSlQA3+fjY7Z3WseJ3G43z9INnsG5Tn3Y2NYDaRbGA6UNsfEvuKe2lOg5tSAfn3rXjVBs4n2Hv/ADqage3tqpoOJQCd7Nap8DRI1p65eqBCZMpTRg4fJUqXLdf7PUiSXFhKnFHsbBUdIBCUDwkBI0NrqqlPAdhg8tZVylAnocb5BiR7fmFouMNEuNc40aKuPHbb7teikBxRcCg4HAdaSKCmM0tfUpm/Ulm/COJdQOR2DD3cGYv7V3Vj1vfdtFxkz3kMR2H2WmFJbCGFaS6pxxTaHdOBenU5VxbmOfnq85C4pybMJF7tNlwrHZyWnGENtqnr9RD8hDY8NeoUdxQk9uz7EjdWvauMTZ+Xb3ytHy+8PfrBaWLZLtD4aVFQY6+6O4yQgLQUepJ2klQUZCj+ykDlN4ttiuU43LVmuDttvPwCbTc0IYbW1coSVKWhLvjv70rI7V93gAjR34Dz+B75kd7w+5nJ8hk3yXa8pv1panSWY7TrseLcpDDIUmO223sNtoGwhO9bPkknMslkRYtgmSJ2RKsLLbRK7kkspVFA/bBeQtsH6fMkj/lWO8U8R2biWHfYtnyHILscivcrIJbl4mpkFEqR2l30glCUtIKklfalIHctR+tZwUJJ2d/8aCU/hFTUAaGqmgV518bsku3yLXkKITsC4NLivx5gSWn2lpKVtqSrwpJBIIPgg13yTvwKqjI+Ibdk2c5HmnKNpsuZ463bo7djsM6zonLgrbQoyFNpc2grdVoAJT3eNd2vlAeH06SXOM1zOmfJbrFVccQaXLxYGS0t644qXSmI+UtstISpn/ZXEgEhTKFk6eQVWtnWE4xyPh93wXNLaZ1jvkVcOfGD7jJdZUPmT6jakrT/ABSoH99ULkOCc0WzivjblWV6t/5V40dE2bCiNpYVdrVJ7W7nawhLiWVLLAQ42SO0yIbBCU70Lgu+WcYZtx03dn87t7OMZXCKIt2jXj4IPNOIJ7mZCVpUlYGztJCgQd+xFB4Od8dZPfZGHYNZnbFbuNLOqO9em5Lz7twmCIpCocRn2DaA4hpxTynSslsI7SFKJtVHlI2NVQ/+STg13vGN3+6cmclXq2498O7AtErKFuW14NqS42p9KUhUnTiUuBTi1HYHnQArMOSOoTi3iu4W/HMhyBMnIru8iPbMftiDLucxalNgBuO3tXgOpWSdAIClb0DoLIKlA+NarBOQeasH47Wu3Tn514v5irmR8csMJy5XeU2kHam4rAUvs7tJ9RQDaSpPcpO91UFyidX/ADtLERDkTg/DX2WXVOoW3ccikpW2lRb1/qYqkqCkK33HSgUkKTWV8k8U4jxr0+ciOcesP2G8oxGcp3IYqkqvEpceM4tC35jiVOurJB2pZJHcrtKTogPraY3PXL8mS9nMJXFmFrR2xrPbLi3IyS5D1XUrE2WgKYgMuMFs+nEUqSlZCky2igoVlWC8AcN8dceq4sxPj+1sYu6Hg/AlNmYJPqn7wvrfK1vE+AS4VeEpT7AAZhjilu4/bHnXFLcXCYUpSjsqPYCST/OvRACQEj2HgUHjWHDcaxZmNDxq1otUGFEEGLAhqUzDYZCirTcdJDSDsn5gkK143rxXsgaGqmlB5Eb9Z/1juXx/2X9g/DRvs30fU+M9fbvxHrb+Ts16HZ2+f9Z3fs16Y19Tv6fn/j6VyKQT5+tax8P8r895/wA2cwWCL+qkrGcNzCPZWETnn2JEaKI7a1hoNtqDiiFKVtahtWh4FBs2ppCwQtIII0QQCCPqK8S02XDeOMYRabFarRjeO2lpxxEeKw3FiRWyVLWQlICEDuKlE+PJJPvutdIXUb1I3zkvk7iHEuHcNu9/43FjeW7+sbseLNZuDanAhJcaCg4lA7h8vZppwE7LfdckG/nNs9z3inMsXs0uzWqBa5DSXR8QifGmiQFtvsuJ7dhUVXgdwKVJ35oM9hS4dyhR7jb5TUmLKaQ8w80sLbdbUAUrSoeCCCCCPcGqyul5xjEepOz2+WtaLryViciKy7ImoQ13WOR6zcdhko7lvOt3qa6o+p4bheEaC1Cem7lR/l7jhWTO2O1WduHd7hZ2Iduk+u021FfUyjfypCFaR5QBpPgbrhzGf9IfBhV9M+lk+D/6WvtBayTse9da5XKFZ4Em6XOUzFhwmVyJL7ywhtlpCSpS1KPgJABJP0ArsI12gAa/d+VSRug4tOIebS62oKQsdyVD2IPsa510plxTCkwovwcp74x8sBbLJWhnTTjne4R+BH3fbv8A8y0D9qu4DsUE0pSgUqCfpXUi3a3TnpseHOYfctz4jS0NrClR3S2h0IWB+FXputr0f2VpPsRQdylQk7AOiN/Q/SpoOKtHaSD/ABrVzp6vVoyvq06g7wu4tKvFlk2qwJiuBj4j4Ntj1A4nsAWWitZA7tje/P0raMpBOzuqO5Y6JOmbm/M3uQeS+O3bpf5EdqK7Lavdwid7Te+1JRHfQj6nzrf76C8gfFN/urV3+rK6K/8AdNO/tZef73T+rK6K/wDdNO/tZef73QbRb/dXHQ3v672a1f8A6sror/3TTv7WXn+91P8AVmdFmtf0Tzv7WXn+90Gz2kp/doa3+WqHWwP8Ctapn6N/o9uDUNifxrdZLduZ+GhpdzC9KEdr1FudiAZfyp9R1xeh+0tR9yaQOgHpLwFu4XvHsAyS1rVAkMSl2nLb8JD8ZSD6zQQzK73QtI0WwCVeBo+KDZcK8e38h+f5UKtHVa83voM6YM0t0GLlGJZRdokRx+VEj3DN786mO5IUFvKQhyX8ilqCVL8AkpBPkV15X6PLpOnWaPjs3A76/aonZ6EJ3NL2phrsU6pHagy9DtVIfI17F5w/tK2Gx4OxuoKjsjXt9aqmH0y8b26Ixb7ffuTI0WM2llhlrk7JEoabSNJSkCdoAAAAD2ArHc36H+njksQxyJZ8wycW4rMQXfP7/L9Dv7e/s9Sae3u7Eb1rfan8qC9ye4aIH8/b+FYTAteb4qnNconXuVlr81xybZLIhLcZEZppjTURtavAW4oHuWo62regAd0qf0ZfRWffiaaf45Xef71U/wBWZ0V+f9Es3yNb/Wy8/wB7oLV6e8OzbCOLoNn5FuSZuQy5k+6z+2W5JSwuXKdkfDh1wlbgaDob7j79ngAeK0hyzhvpW6d+d89t3VS/MvWMZ+HcgwONMiPPw4r70hwzoUaMx3BEhDjrHpq9NA7HO3ewd7VWvpP6beFMVusmySsrwrHIoculzXG5Iv0CI2EoAW+72zkoHyIAK1fRI86Himcf6Qeie526HmmKdNvIknFbzYXZqcijXm7pC4riVgsGCqcm5OKcSkaSiKpC0rQQSCTQZDwPinWbfcGOC3rJ42D4XDdXHsd3mQEuZUu1FKgyytouOMMLQhTYDiitz7v5gk1ePEfTXxFwotyfh+Mh69yiFTL9c3VTLnJUO8ArkubX4Dq0gAgBJ7fYarCsK6T+ma5Yk2jB05emwS0MH4aJyDkLbQ9BQU2hbXxg7VNKSNIUNoUnWgQa++IdB3TPgV4kZHg2MZPj10ltLYkTbXnN9ivutqWlakKW3MCikqQgkb1tI/Kg2BCRr6jxr3qquprKLfZOGcvsj8G8zJ2Q49dLbbmLZZplwW7IXEcSlCvhmnPT2VJAUvtTs+9fX/JxwL/1Pyj/APVHJf79XiZJ0dcIZiuI7liM7vK4AeEVU7kXIXywHWy272d809veglKte4JB2PFBkHTpyJP5I4fxm+3ywz7JfUW6LHvNtmWqXBVEnBhtTrSUSUIUtKSrQWnuSSCAo6OrKKyBvVa5X39H3005dMlS83tGYZMH5QlR2rtm14fTDV8MwwoNH4kKIUmK0SVqWr5QkKCEIQn3V9G3D79nk4rNu/I8vF37exbEY89yHfDbmI7YUnsQ2JQJSpJQkpWpSQGkdoT83cF4lRAB0Kjv/wCn0rWln9G/0fRoMq2R+Nrs3DnKbXJYRmF6Dbym+70ytIl6UUlaiN+xUayfDui/gbjy1vWPAoebY5bpL6pL0S1chZBFZcdKUoK1IbmhJUUoSnZHskD6Cgu/uJPjydbqgcE4IzXB+Q+Tp0bIEJtHJeRMZQLnCf8AQmW1xn0R8F6SkqS6l1LJC3O9OkrI7frXyxvoO6esJS5GwKPm+LwJiibnAtGd3mPHuifTWhKJAEnuUEhZI7VJP0JKSUnw/wCrM6Kx4HE07Xtr9bLz7fl/tdBbfH/G0vFeTOUs8mOJV+u93t0iKht4qAjRbXFjDuToBKy6iRvRO09ntrVfSBiGUWXme853Fftsmw5JaYFvlsq7m5MR6GZSkupVspcSv4ntKNAp7e7uP4TT/wDVl9FewTxNNJA1v9a7z/e6kfozOiwHf9E87fgb/Wy8+w9v/FUFj9NfFmVcO4JcMMyu8xbo7+sN0nwpEdPaPg5EhTrSVJ14UAog7J9vc1hfWXkIxuRwM+i1x5UmbzRjluYceWv/ADX125bbjqUpIClekp1ACtgep3a2kV5Z/Rl9FZ/9ks3+1d4/vVe7g36P/pK45y+0Z3ivFPp3qxSRNt70y93Gc2xISCEOhmQ+tsrST3JUUkpUEqTpSQQGwo9qmoA0NVNBxKQrYI96kDQ1U0oFKUoFcSgE79v4VypQcSe3wANCvlGmRpiFrjSGng2tTSy2sKCVpJSpJ17EEEEfQgivsUg79/NfKPDixEKRFjtMpWtTqg2gJClqJUpR19SSST9SSaD6ippSgUpSgUpSgVBAPvU0oIA1U0pQKUpQKUpQaWfpGM3kOZFwD09TICZONcsch26NkjZWU/FQIs6FuIdfMErXJbWVJUlQLKQDpRrc/wB/pvX+PaqG6veCJXLeNY1nOJQGJOe8T3tjMcWacbSRPkRVJeVbVqKk9rcgstJJCk6WhpROkkHMrbz1hVznM2NNlzOPd3VeiuDIxK5I9N/9plUj0DF2FAp7w6WifIWU6UQonjLKEYV+kU5S4ps9qmItWWY3bcnklhAWw3cUo7HXnVElSVOI7UgA6PYfFbgJII2Ko3g3izI2ORM16gs+YegZBnaIsONZ3koDtntkbuDMd5TS1tOu9xUsrT/5gNnVXkPagmlKUClKUClKUClKUHBxZQkq7SdDegNmvhbJwudti3IRZEYSmUPBmQ36brfckHtWn9lQ3oj6EGuyUg+9AAkaH0oJpSlApSlApSlApSlApSlApSlApSlApSlApSlApSlApSlApSlApSlBBGzvZqAkA+CfbWq5UoI0P+NAAPappQKUpQKUpQKUpQKUpQKUpQKUpQKUpQKUpQKUpQf/2Q==" width="200" height="98" /></p> <p>c) Tỉ lệ phần trăm số học sinh nội tr&uacute; chiếm l&agrave;:&nbsp;<math xmlns="http://www.w3.org/1998/Math/MathML"><mfrac><mn>30</mn><mn>180</mn></mfrac><mo>.</mo><mn>100</mn><mo>=</mo><mn>16</mn><mo>,</mo><mn>7</mn><mo>%</mo></math></p> <p>d) Gọi x,y,z lần lượt l&agrave; số học sinh nội tr&uacute;, b&aacute;n tr&uacute;, ngoại tr&uacute;. Ta c&oacute; :&nbsp;</p> <p><span class="mce-nbsp-wrap" contenteditable="false">&nbsp;&nbsp;&nbsp;</span><span class="mce-nbsp-wrap" contenteditable="false">&nbsp;&nbsp;&nbsp;</span><span class="mce-nbsp-wrap" contenteditable="false">&nbsp;&nbsp;&nbsp;</span><span class="mce-nbsp-wrap" contenteditable="false">&nbsp;&nbsp;&nbsp;</span><span class="mce-nbsp-wrap" contenteditable="false">&nbsp;&nbsp;&nbsp;</span><span class="mce-nbsp-wrap" contenteditable="false">&nbsp;&nbsp;&nbsp;</span><math xmlns="http://www.w3.org/1998/Math/MathML"><mfrac><mi>x</mi><mn>1</mn></mfrac><mo>=</mo><mfrac><mi>y</mi><mn>2</mn></mfrac><mo>=</mo><mfrac><mi>z</mi><mn>3</mn></mfrac><mo>=</mo><mfrac><mrow><mi>x</mi><mo>+</mo><mi>y</mi><mo>+</mo><mi>z</mi></mrow><mrow><mn>1</mn><mo>+</mo><mn>2</mn><mo>+</mo><mn>3</mn></mrow></mfrac><mo>=</mo><mfrac><mn>1800</mn><mn>6</mn></mfrac><mo>=</mo><mn>300</mn></math></p> <p><span class="mce-nbsp-wrap" contenteditable="false">&nbsp;&nbsp;&nbsp;</span><span class="mce-nbsp-wrap" contenteditable="false">&nbsp;&nbsp;&nbsp;</span><span class="mce-nbsp-wrap" contenteditable="false">&nbsp;&nbsp;&nbsp;</span><span class="mce-nbsp-wrap" contenteditable="false">&nbsp;&nbsp;&nbsp;</span>n&ecirc;n x = 300</p> <p><span class="mce-nbsp-wrap" contenteditable="false">&nbsp;&nbsp;&nbsp;</span><span class="mce-nbsp-wrap" contenteditable="false">&nbsp;&nbsp;&nbsp;</span><span class="mce-nbsp-wrap" contenteditable="false">&nbsp;&nbsp;&nbsp;</span><span class="mce-nbsp-wrap" contenteditable="false">&nbsp;&nbsp;&nbsp;</span><span class="mce-nbsp-wrap" contenteditable="false">&nbsp;&nbsp;&nbsp;</span><span class="mce-nbsp-wrap" contenteditable="false">&nbsp;&nbsp;&nbsp;</span> y = 600</p> <p><span class="mce-nbsp-wrap" contenteditable="false">&nbsp;&nbsp;&nbsp;</span><span class="mce-nbsp-wrap" contenteditable="false">&nbsp;&nbsp;&nbsp;</span><span class="mce-nbsp-wrap" contenteditable="false">&nbsp;&nbsp;&nbsp;</span><span class="mce-nbsp-wrap" contenteditable="false">&nbsp;&nbsp;&nbsp;</span><span class="mce-nbsp-wrap" contenteditable="false">&nbsp;&nbsp;&nbsp;</span><span class="mce-nbsp-wrap" contenteditable="false">&nbsp;&nbsp;&nbsp;</span> z = 900</p> <p>Vậy số học sinh nội tr&uacute;: 300 3m, b&aacute;n tr&uacute;: 600 em v&agrave; ngoại tr&uacute;: 900 em.</p>
Hướng dẫn Giải Bài 94 (Trang 105, SGK Toán Hình học 9, Tập 2)
GV: GV colearn
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Hướng dẫn Giải Bài 94 (Trang 105, SGK Toán Hình học 9, Tập 2)
GV: GV colearn