Hướng dẫn giải Bài 6 (Trang 16, SGK Toán 7, Tập 1 - Bộ Cánh Diều)
<p style="text-align: center;">Tính diện tích mặt bằng của ngôi nhà trong hình vẽ bên (các số đo trên hình tính theo đơn vị mét):<br /><img class="wscnph" style="max-width: 100%;" src="https://static.colearn.vn:8413/v1.0/upload/library/19082022/11-Wt9kVm.png" /></p>
<p><span style="text-decoration: underline;"><em><strong>Hướng dẫn Giải:</strong></em></span></p>
<p style="text-align: center;"><img class="wscnph" style="max-width: 100%;" src="https://static.colearn.vn:8413/v1.0/upload/library/19082022/12-iTirR8.png" /></p>
<p>Chia mặt bằng của ngôi nhà thành 2 phần A và B như trên.</p>
<p>Diện tích phần A là: <span id="MathJax-Element-1-Frame" class="mjx-chtml MathJax_CHTML" style="margin: 0px; padding: 1px 0px; display: inline-block; line-height: 0; text-indent: 0px; text-align: left; text-transform: none; font-style: normal; font-weight: normal; font-size: 16.94px; letter-spacing: normal; overflow-wrap: normal; word-spacing: normal; white-space: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; border: 0px; position: relative;" tabindex="0" role="presentation" data-mathml="<math xmlns="http://www.w3.org/1998/Math/MathML"><mn>7</mn><mo>,</mo><mn>1.3</mn><mo>,</mo><mn>4</mn><mo>=</mo><mn>24</mn><mo>,</mo><mn>14</mn><mo stretchy="false">(</mo><msup><mi>m</mi><mn>2</mn></msup><mo stretchy="false">)</mo></math>"><span id="MJXc-Node-1" class="mjx-math" aria-hidden="true"><span id="MJXc-Node-2" class="mjx-mrow"><span id="MJXc-Node-3" class="mjx-mn"></span></span></span><math xmlns="http://www.w3.org/1998/Math/MathML"><mn>7</mn><mo>,</mo><mn>1</mn><mo>.</mo><mn>3</mn><mo>,</mo><mn>4</mn><mo>=</mo><mn>24</mn><mo>,</mo><mn>14</mn><mo> </mo><mo>(</mo><msup><mi>m</mi><mn>2</mn></msup><mo>)</mo></math></span></p>
<p>Chiều dài của phần B là: <span id="MathJax-Element-2-Frame" class="mjx-chtml MathJax_CHTML" style="margin: 0px; padding: 1px 0px; display: inline-block; line-height: 0; text-indent: 0px; text-align: left; text-transform: none; font-style: normal; font-weight: normal; font-size: 16.94px; letter-spacing: normal; overflow-wrap: normal; word-spacing: normal; white-space: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; border: 0px; position: relative;" tabindex="0" role="presentation" data-mathml="<math xmlns="http://www.w3.org/1998/Math/MathML"><mn>5</mn><mo>,</mo><mn>1</mn><mo>+</mo><mn>5</mn><mo>,</mo><mn>8</mn><mo>=</mo><mn>10</mn><mo>,</mo><mn>9</mn><mo stretchy="false">(</mo><mi>m</mi><mo stretchy="false">)</mo></math>"><span id="MJXc-Node-17" class="mjx-math" aria-hidden="true"><span id="MJXc-Node-18" class="mjx-mrow"><span id="MJXc-Node-19" class="mjx-mn"><span class="mjx-char MJXc-TeX-main-R">5</span></span><span id="MJXc-Node-20" class="mjx-mo"><span class="mjx-char MJXc-TeX-main-R">,</span></span><span id="MJXc-Node-21" class="mjx-mn MJXc-space1"><span class="mjx-char MJXc-TeX-main-R">1</span></span><span id="MJXc-Node-22" class="mjx-mo MJXc-space2"><span class="mjx-char MJXc-TeX-main-R">+</span></span><span id="MJXc-Node-23" class="mjx-mn MJXc-space2"><span class="mjx-char MJXc-TeX-main-R">5</span></span><span id="MJXc-Node-24" class="mjx-mo"><span class="mjx-char MJXc-TeX-main-R">,</span></span><span id="MJXc-Node-25" class="mjx-mn MJXc-space1"><span class="mjx-char MJXc-TeX-main-R">8</span></span><span id="MJXc-Node-26" class="mjx-mo MJXc-space3"><span class="mjx-char MJXc-TeX-main-R">=</span></span><span id="MJXc-Node-27" class="mjx-mn MJXc-space3"><span class="mjx-char MJXc-TeX-main-R">10</span></span><span id="MJXc-Node-28" class="mjx-mo"><span class="mjx-char MJXc-TeX-main-R">,</span></span><span id="MJXc-Node-29" class="mjx-mn MJXc-space1"><span class="mjx-char MJXc-TeX-main-R">9</span></span><span id="MJXc-Node-30" class="mjx-mo"><span class="mjx-char MJXc-TeX-main-R">(</span></span><span id="MJXc-Node-31" class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I">m</span></span><span id="MJXc-Node-32" class="mjx-mo"><span class="mjx-char MJXc-TeX-main-R">)</span></span></span></span></span></p>
<p>Chiều rộng của phần B là: <span id="MathJax-Element-3-Frame" class="mjx-chtml MathJax_CHTML" style="margin: 0px; padding: 1px 0px; display: inline-block; line-height: 0; text-indent: 0px; text-align: left; text-transform: none; font-style: normal; font-weight: normal; font-size: 16.94px; letter-spacing: normal; overflow-wrap: normal; word-spacing: normal; white-space: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; border: 0px; position: relative;" tabindex="0" role="presentation" data-mathml="<math xmlns="http://www.w3.org/1998/Math/MathML"><mn>2</mn><mo>,</mo><mn>0</mn><mo>+</mo><mn>4</mn><mo>,</mo><mn>7</mn><mo>=</mo><mn>6</mn><mo>,</mo><mn>7</mn><mo stretchy="false">(</mo><mi>m</mi><mo stretchy="false">)</mo></math>"><span id="MJXc-Node-33" class="mjx-math" aria-hidden="true"><span id="MJXc-Node-34" class="mjx-mrow"><span id="MJXc-Node-35" class="mjx-mn"><span class="mjx-char MJXc-TeX-main-R">2</span></span><span id="MJXc-Node-36" class="mjx-mo"><span class="mjx-char MJXc-TeX-main-R">,</span></span><span id="MJXc-Node-37" class="mjx-mn MJXc-space1"><span class="mjx-char MJXc-TeX-main-R">0</span></span><span id="MJXc-Node-38" class="mjx-mo MJXc-space2"><span class="mjx-char MJXc-TeX-main-R">+</span></span><span id="MJXc-Node-39" class="mjx-mn MJXc-space2"><span class="mjx-char MJXc-TeX-main-R">4</span></span><span id="MJXc-Node-40" class="mjx-mo"><span class="mjx-char MJXc-TeX-main-R">,</span></span><span id="MJXc-Node-41" class="mjx-mn MJXc-space1"><span class="mjx-char MJXc-TeX-main-R">7</span></span><span id="MJXc-Node-42" class="mjx-mo MJXc-space3"><span class="mjx-char MJXc-TeX-main-R">=</span></span><span id="MJXc-Node-43" class="mjx-mn MJXc-space3"><span class="mjx-char MJXc-TeX-main-R">6</span></span><span id="MJXc-Node-44" class="mjx-mo"><span class="mjx-char MJXc-TeX-main-R">,</span></span><span id="MJXc-Node-45" class="mjx-mn MJXc-space1"><span class="mjx-char MJXc-TeX-main-R">7</span></span><span id="MJXc-Node-46" class="mjx-mo"><span class="mjx-char MJXc-TeX-main-R">(</span></span><span id="MJXc-Node-47" class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I">m</span></span><span id="MJXc-Node-48" class="mjx-mo"><span class="mjx-char MJXc-TeX-main-R">)</span></span></span></span></span></p>
<p>Diện tích phần B là: <span id="MathJax-Element-4-Frame" class="mjx-chtml MathJax_CHTML" style="margin: 0px; padding: 1px 0px; display: inline-block; line-height: 0; text-indent: 0px; text-align: left; text-transform: none; font-style: normal; font-weight: normal; font-size: 16.94px; letter-spacing: normal; overflow-wrap: normal; word-spacing: normal; white-space: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; border: 0px; position: relative;" tabindex="0" role="presentation" data-mathml="<math xmlns="http://www.w3.org/1998/Math/MathML"><mn>10</mn><mo>,</mo><mn>9.6</mn><mo>,</mo><mn>7</mn><mo>=</mo><mn>73</mn><mo>,</mo><mn>03</mn><mo stretchy="false">(</mo><mi>m</mi><mo stretchy="false">)</mo></math>"><span id="MJXc-Node-49" class="mjx-math" aria-hidden="true"><span id="MJXc-Node-50" class="mjx-mrow"><span id="MJXc-Node-51" class="mjx-mn"><span class="mjx-char MJXc-TeX-main-R">10</span></span><span id="MJXc-Node-52" class="mjx-mo"><span class="mjx-char MJXc-TeX-main-R">,</span></span><span id="MJXc-Node-53" class="mjx-mn MJXc-space1"><span class="mjx-char MJXc-TeX-main-R">9.6</span></span><span id="MJXc-Node-54" class="mjx-mo"><span class="mjx-char MJXc-TeX-main-R">,</span></span><span id="MJXc-Node-55" class="mjx-mn MJXc-space1"><span class="mjx-char MJXc-TeX-main-R">7</span></span><span id="MJXc-Node-56" class="mjx-mo MJXc-space3"><span class="mjx-char MJXc-TeX-main-R">=</span></span><span id="MJXc-Node-57" class="mjx-mn MJXc-space3"><span class="mjx-char MJXc-TeX-main-R">73</span></span><span id="MJXc-Node-58" class="mjx-mo"><span class="mjx-char MJXc-TeX-main-R">,</span></span><span id="MJXc-Node-59" class="mjx-mn MJXc-space1"><span class="mjx-char MJXc-TeX-main-R">03</span></span><span id="MJXc-Node-60" class="mjx-mo"><span class="mjx-char MJXc-TeX-main-R">(</span></span><span id="MJXc-Node-61" class="mjx-mi"><span class="mjx-char MJXc-TeX-math-I">m</span></span><span id="MJXc-Node-62" class="mjx-mo"><span class="mjx-char MJXc-TeX-main-R">)</span></span></span></span></span></p>
<p>Diện tích mặt bằng của ngôi nhà là:</p>
<p>24,14 + 73,03 = 97,17 (m<sup>2</sup>)</p>
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