Luyện tập chung 3
<h3 id="1-tiacutenh-chu-vi-vagrave-dien-tiacutech-caacutec-higravenh-sau">1. Tính chu vi và diện tích các hình sau:</h3> <p>a)</p> <p><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/b38-h1-1665909051.jpg.webp" width="386" height="262" alt="hinh-anh-luyen-tap-chung-3-1631-0" title="hinh-anh-luyen-tap-chung-3-1631-0" loading="lazy"></p><div> <div class="ads-horizontal-wrapped" style="height: auto !important; min-height: 0px !important;">
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</div>&nbsp;<p></p> <p>b)</p> <p><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/b38-h2-1665909092.jpg.webp" width="208" height="236" alt="hinh-anh-luyen-tap-chung-3-1631-1" title="hinh-anh-luyen-tap-chung-3-1631-1" loading="lazy"></p> <h3 id="2-tigravem-so-do-thiacutech-hop-cho-moi-ocirc-trong-bang-duoi-dacircy">2. Tìm số đo thích hợp cho mỗi ô ? trong bảng dưới đây:</h3> <table style="border-collapse: collapse; width: 100.068%; height: 111.921px;" border="1"> <tbody> <tr style="height: 22.3843px;"> <td style="width: 27.3713%; text-align: center; height: 22.3843px;">Tên hình</td> <td style="width: 15.2416%; text-align: center; height: 22.3843px;">Chiều dài</td> <td style="width: 14.619%; text-align: center; height: 22.3843px;">Chiều rộng</td> <td style="width: 14.308%; text-align: center; height: 22.3843px;">Cạnh</td> <td style="width: 13.9969%; text-align: center; height: 22.3843px;">Chu vi</td> <td style="width: 14.308%; text-align: center; height: 22.3843px;">Diện tích</td> </tr> <tr style="height: 22.3843px;"> <td style="width: 27.3713%; height: 22.3843px;">Hình chữ nhật</td> <td style="width: 15.2416%; text-align: center; height: 22.3843px;">5 cm</td> <td style="width: 14.619%; text-align: center; height: 22.3843px;">2 cm</td> <td style="width: 14.308%; text-align: center; height: 22.3843px;">x</td> <td style="width: 13.9969%; text-align: center; height: 22.3843px;">?</td> <td style="width: 14.308%; text-align: center; height: 22.3843px;">?</td> </tr> <tr style="height: 22.3843px;"> <td style="width: 27.3713%; height: 22.3843px;">Hình chữ nhật</td> <td style="width: 15.2416%; text-align: center; height: 22.3843px;">15 cm&nbsp;</td> <td style="width: 14.619%; text-align: center; height: 22.3843px;">3 cm</td> <td style="width: 14.308%; text-align: center; height: 22.3843px;">x</td> <td style="width: 13.9969%; text-align: center; height: 22.3843px;">?</td> <td style="width: 14.308%; text-align: center; height: 22.3843px;">?</td> </tr> <tr style="height: 22.3843px;"> <td style="width: 27.3713%; height: 22.3843px;">Hình vuông</td> <td style="width: 15.2416%; text-align: center; height: 22.3843px;">x</td> <td style="width: 14.619%; text-align: center; height: 22.3843px;">x</td> <td style="width: 14.308%; text-align: center; height: 22.3843px;">7 cm</td> <td style="width: 13.9969%; text-align: center; height: 22.3843px;">?</td> <td style="width: 14.308%; text-align: center; height: 22.3843px;">?</td> </tr> <tr style="height: 22.3843px;"> <td style="width: 27.3713%; height: 22.3843px;">Hình vuông</td> <td style="width: 15.2416%; text-align: center; height: 22.3843px;">x</td> <td style="width: 14.619%; text-align: center; height: 22.3843px;">x</td> <td style="width: 14.308%; text-align: center; height: 22.3843px;">9 cm</td> <td style="width: 13.9969%; text-align: center; height: 22.3843px;">?</td> <td style="width: 14.308%; text-align: center; height: 22.3843px;">?</td> </tr> </tbody> </table> <h3 id="3">3.</h3> <p>Mai ghép 10 tấm thảm hình vuông có cạnh 40 cm thành một tấm thảm hình chữ nhật lớn có chiều rộng 80 cm. Hỏi chu vi của tấm thảm Mai ghép được bằng bao nhiêu xăng-ti-mét?</p> <p><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/b38-h3-1665909396.jpg.webp" width="633" height="208" alt="hinh-anh-luyen-tap-chung-3-1631-2" title="hinh-anh-luyen-tap-chung-3-1631-2" loading="lazy"></p> <h3 id="4">4.</h3> <h4>Quan sát sơ đồ các phòng của một trung tâm thể dục thẩm mĩ sau và trả lời các câu hỏi:</h4> <p><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/b38-h4-1665909466.jpg.webp" width="385" height="349" alt="hinh-anh-luyen-tap-chung-3-1631-3" title="hinh-anh-luyen-tap-chung-3-1631-3" loading="lazy"></p> <p>a) Phòng nào có diện tích lớn nhất?</p> <p>b) Phòng nào có diện tích bé nhất?</p> <h3 id="5">5.</h3> <h4>Theo em, miếng đề can ở hình A có đủ dán thành hình B không?</h4> <p style="text-align: center;"><img src="/uploads/tinymce/b38-h5-1665909570.jpg.webp" width="292" height="304" alt="hinh-anh-luyen-tap-chung-3-1631-4" title="hinh-anh-luyen-tap-chung-3-1631-4" loading="lazy"></p> <p style="text-align: center;"><img src="/uploads/tinymce/b38-h6-1665909592.jpg.webp" width="322" height="295" alt="hinh-anh-luyen-tap-chung-3-1631-5" title="hinh-anh-luyen-tap-chung-3-1631-5" loading="lazy"></p><div> <div class="ads-horizontal-wrapped">
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</div><p></p> <h3 id="6-thuc-hagravenh">6. Thực hành:</h3> <p>Tạo lập những hình chữ nhật có chu vi bằng nhau nhưng diện tích khác nhau và ghi lại kết quả.</p> <p><strong>Mẫu:</strong></p> <table style="border-collapse: collapse; width: 72.0984%; margin-left: auto; margin-right: auto;" border="1"> <tbody> <tr> <td style="width: 20.0443%; text-align: center;">Hình</td> <td style="width: 20.0443%; text-align: center;">Chiều dài</td> <td style="width: 20.0443%; text-align: center;">Chiều rộng</td> <td style="width: 20.0443%; text-align: center;">Chu vi</td> <td style="width: 19.8216%; text-align: center;">Diện tích</td> </tr> <tr> <td style="width: 20.0443%; text-align: center;">A</td> <td style="width: 20.0443%; text-align: center;">5 cm</td> <td style="width: 20.0443%; text-align: center;">3 cm</td> <td style="width: 20.0443%; text-align: center;">16 cm</td> <td style="width: 19.8216%; text-align: center;">15 cm²</td> </tr> <tr> <td style="width: 20.0443%; text-align: center;">B</td> <td style="width: 20.0443%; text-align: center;">6 cm</td> <td style="width: 20.0443%; text-align: center;">2 cm</td> <td style="width: 20.0443%; text-align: center;">16 cm</td> <td style="width: 19.8216%; text-align: center;">12 cm²</td> </tr> </tbody> </table> <p><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/b38-h7-1665909970.jpg.webp" width="310" height="322" alt="hinh-anh-luyen-tap-chung-3-1631-6" title="hinh-anh-luyen-tap-chung-3-1631-6" loading="lazy"></p>