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Trang chủ / Giải bài tập / Lớp 8 / Toán học / Luyện Tập Chung
Luyện Tập Chung
Hướng dẫn giải Bài 20 (Trang 14 SGK Toán Đại số 8, Tập 2)
<p>Trung bảo Nghĩa hay nghĩ ở trong đ&acirc;̀u (kh&ocirc;ng cho Trung bi&ecirc;́t) m&ocirc;̣t s&ocirc;́ tự nhi&ecirc;n tùy ý, sau đó Nghĩa th&ecirc;m 5 vào s&ocirc;́ &acirc;́y,</p> <p>nh&acirc;n t&ocirc;̉ng nh&acirc;̣n được với 2, được bao nhi&ecirc;u đem trừ đi 10, ti&ecirc;́p tục nh&acirc;n hi&ecirc;̣u tìm được với 3 r&ocirc;̀i c&ocirc;̣ng th&ecirc;m 66, cu&ocirc;́i</p> <p>cùng chia k&ecirc;́t quả cho 6. Chẳng hạn. n&ecirc;́u Nghĩa nghĩ đ&ecirc;́n s&ocirc;́ 6 thì quá trình tính toán sẽ là:</p> <p><math xmlns="http://www.w3.org/1998/Math/MathML"><mn>7</mn><mo>&#8594;</mo><mo>(</mo><mn>7</mn><mo>+</mo><mn>5</mn><mo>=</mo><mn>12</mn><mo>)</mo><mo>&#8594;</mo><mo>(</mo><mn>12</mn><mo>.</mo><mn>2</mn><mo>=</mo><mn>24</mn><mo>)</mo><mo>&#8594;</mo><mo>(</mo><mn>24</mn><mo>-</mo><mn>10</mn><mo>=</mo><mn>14</mn><mo>)</mo><mo>&#8594;</mo><mo>(</mo><mn>14</mn><mo>.</mo><mn>3</mn><mo>=</mo><mn>42</mn><mo>)</mo><mo>&#8594;</mo><mo>(</mo><mn>42</mn><mo>+</mo><mn>66</mn><mo>=</mo><mn>108</mn><mo>)</mo><mo>&#8594;</mo><mo>(</mo><mn>108</mn><mo>:</mo><mn>6</mn><mo>=</mo><mn>18</mn><mo>)</mo></math></p> <p>Trung chỉ c&acirc;̀n bi&ecirc;́t k&ecirc;́t quả cu&ocirc;́i cùng (s&ocirc;́ 18) là đoán ngay được s&ocirc;́ Nghĩa đã nghĩ là s&ocirc;́ nào</p> <p>Nghĩa thử m&acirc;́y l&acirc;̀n, Trung đ&ecirc;̀u đoán đúng. Nghĩa phục tài Trung lắm. Đ&ocirc;́ em tìm ra bí quy&ecirc;́t của Trung đ&acirc;́y!</p> <p><strong>Giải</strong></p> <p>Ta bi&ecirc;̉u thị các vi&ecirc;̣c Nghĩa thực hi&ecirc;̣n theo ý của Trung như sau: Gọi x là s&ocirc;́ mà Nghĩa nghĩ ra thì bi&ecirc;̉u thức bi&ecirc;̉u di&ecirc;̃n</p> <p>theo k&ecirc;́t quả là: <math xmlns="http://www.w3.org/1998/Math/MathML"><mfenced open="[" close="]"><mrow><mn>3</mn><mfenced open="[" close="]"><mrow><mn>2</mn><mo>(</mo><mi>x</mi><mo>+</mo><mn>5</mn><mo>)</mo><mo>-</mo><mn>10</mn></mrow></mfenced><mo>+</mo><mn>66</mn></mrow></mfenced><mo>:</mo><mn>6</mn></math></p> <p>Rút gọn bi&ecirc;̉u thức này ta được x + 11. Trung chỉ vi&ecirc;̣c l&acirc;́y k&ecirc;́t quả cu&ocirc;́i cùng mà Nghĩa cho bi&ecirc;́t, r&ocirc;̀i đem trừ k&ecirc;́t quả</p> <p>đó đi 11 là được s&ocirc;́ Nghĩa nghĩ Bí quy&ecirc;́t của Trung là bảo Nghĩa làm có vẻ rắc r&ocirc;́i nhưng k&ecirc;́t quả Trung bi&ecirc;́t trước</p>
Hướng dẫn Giải Bài 20 (Trang 14, SGK Toán 8, Tập 2, Phần Đại Số)
GV: GV colearn
Xem lời giải bài tập khác cùng bài
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class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise">Hướng dẫn giải Bài 14 (Trang 13 SGK Toán Đại số 8, Tập 2)</div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> 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</div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div>
Xem lời giải
Hướng dẫn giải Bài 15 (Trang 13 SGK Toán Đại số 8, Tập 2)
Xem lời giải
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class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div 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class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise">Hướng dẫn giải Bài 16 (Trang 13 SGK Toán Đại số 8, Tập 2)</div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> 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Xem lời giải
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class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div 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class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise">Hướng dẫn giải Bài 17 (Trang 14 SGK Toán Đại số 8, Tập 2)</div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> 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</div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div>
Xem lời giải
Hướng dẫn giải Bài 18 (Trang 14 SGK Toán Đại số 8, Tập 2)
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Hướng dẫn giải Bài 19 (Trang 14 SGK Toán Đại số 8, Tập 2)
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Hướng dẫn Giải Bài 20 (Trang 14, SGK Toán 8, Tập 2, Phần Đại Số)
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