Xếp hình
<h3 id="1">1.</h3> <p><strong>Quan sát các hình phẳng và hình khối dưới đây.</strong></p> <p>a) Kể tên các hình phẳng.</p> <p>b) Kể tên các hình khối.</p> <p><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/b14-h1-1666288091.jpg.webp" width="470" height="187" alt="hinh-anh-xep-hinh-1746-0" title="hinh-anh-xep-hinh-1746-0" loading="lazy"></p><div> <div class="ads-horizontal-wrapped" style="height: auto !important; min-height: 0px !important;">
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</div><p></p> <h3 id="2">2.</h3> <p><strong>Chọn các hình nào ở bài 1 để ghép lại thành các hình tứ giác sau?</strong></p> <p>a)&nbsp;</p> <p><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/b14-h2-1666288192.jpg.webp" width="268" height="164" alt="hinh-anh-xep-hinh-1746-1" title="hinh-anh-xep-hinh-1746-1" loading="lazy"></p> <p>b)&nbsp;</p> <p><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/b14-h3-1666288221.jpg.webp" width="268" height="162" alt="hinh-anh-xep-hinh-1746-2" title="hinh-anh-xep-hinh-1746-2" loading="lazy"></p> <h3 id="3-xep-higravenh">3. Xếp hình</h3> <p><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/b14-h4-1666288298.jpg.webp" width="530" height="251" alt="hinh-anh-xep-hinh-1746-3" title="hinh-anh-xep-hinh-1746-3" loading="lazy"></p> <h3 id="bagravei-tap-1">Bài tập 1:</h3> <p><strong>Mỗi mảnh giấy (A, B, C, D) là của ô trống nào trong hình dưới đây?</strong></p> <p><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/b14-h5-1666288354.jpg.webp" width="560" height="250" alt="hinh-anh-xep-hinh-1746-4" title="hinh-anh-xep-hinh-1746-4" loading="lazy"></p> <h3 id="bagravei-tap-2">Bài tập 2:</h3> <p><strong>Hình thứ năm có bao nhiêu khối lập phương?</strong></p> <p><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/b14-h6-1666288432.jpg.webp" width="556" height="137" alt="hinh-anh-xep-hinh-1746-5" title="hinh-anh-xep-hinh-1746-5" loading="lazy"></p><div> <div class="ads-horizontal-wrapped">
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</div><p></p> <h3 id="bagravei-tap-3">Bài tập 3:</h3> <p><strong>Cần bao nhiêu khối lập phương để xếp hình tưởng rào dưới đây?</strong></p> <p><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/b14-h7-1666288526.jpg.webp" width="612" height="188" alt="hinh-anh-xep-hinh-1746-6" title="hinh-anh-xep-hinh-1746-6" loading="lazy"></p> <p><strong>Đất nước em</strong></p> <p>Với các phiến đá không phải lúc nào cũng là khối hộp chữ nhật hay khối lập phương, bà con người dân tộc Mông (tỉnh Hà Giang) khéo léo xếp chúng thành những bờ tường rào rất vững chắc mà không cần chất kết dính (vôi, vữa, ...).</p> <p><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/b14-h8-1666288648.jpg.webp" width="621" height="176" alt="hinh-anh-xep-hinh-1746-7" title="hinh-anh-xep-hinh-1746-7" loading="lazy"></p>