Bài 14: Khối Lập Phương, Khối Hộp Chữ Nhật
<h3 id="khaacutem-phaacute">Khám phá</h3> <p>a) Khối lập phương</p> <p><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/921-1661574125.png.webp" alt="hinh-anh-bai-14-khoi-lap-phuong-khoi-hop-chu-nhat-223-0" title="hinh-anh-bai-14-khoi-lap-phuong-khoi-hop-chu-nhat-223-0" loading="lazy"></p><div> <div class="ads-horizontal-wrapped" style="height: auto !important; min-height: 0px !important;">
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</div>b) Khối hộp chữ nhật<p></p> <p><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/922-1661574141.png.webp" width="496" height="286" alt="hinh-anh-bai-14-khoi-lap-phuong-khoi-hop-chu-nhat-223-1" title="hinh-anh-bai-14-khoi-lap-phuong-khoi-hop-chu-nhat-223-1" loading="lazy"></p> <h3 id="hoat-dong">Hoạt động</h3> <h4>1. Những hình nào là khối lập phương?</h4> <p><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/931-1661574172.png.webp" width="640" height="199" alt="hinh-anh-bai-14-khoi-lap-phuong-khoi-hop-chu-nhat-223-2" title="hinh-anh-bai-14-khoi-lap-phuong-khoi-hop-chu-nhat-223-2" loading="lazy"></p> <h4>2. Những hình nào là khối hộp chữ nhật?</h4> <p><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/932-1661574196.png.webp" alt="hinh-anh-bai-14-khoi-lap-phuong-khoi-hop-chu-nhat-223-3" title="hinh-anh-bai-14-khoi-lap-phuong-khoi-hop-chu-nhat-223-3" loading="lazy"></p> <h4>3.</h4> <p>a) Mỗi đồ vật sau có dạng hình gì?</p> <p><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/933-1661574229.png.webp" alt="hinh-anh-bai-14-khoi-lap-phuong-khoi-hop-chu-nhat-223-4" title="hinh-anh-bai-14-khoi-lap-phuong-khoi-hop-chu-nhat-223-4" loading="lazy">Khối lập phương</p> <p>Khối hộp chữ nhật</p> <p>b) Em hãy nêu tên một số đồ vật có dạng khối lập phương hoặc khối hộp chữ nhật ở quanh ta nhé!</p> <h3 id="luyen-tap">Luyện tập</h3> <h4>1. Bạn Mai xếp được hình dưới đây. Trong hình đó:</h4> <p>a) Có bao nhiêu khối lập phương?</p> <p>b) Có bao nhiêu khối hộp chữ nhật màu đỏ?</p> <p><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/941-1661574306.png.webp" width="493" height="325" alt="hinh-anh-bai-14-khoi-lap-phuong-khoi-hop-chu-nhat-223-5" title="hinh-anh-bai-14-khoi-lap-phuong-khoi-hop-chu-nhat-223-5" loading="lazy"></p><div> <div class="ads-horizontal-wrapped" style="height: auto !important; min-height: 0px !important;">
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</div><p></p> <h4>2. Dùng các khối lập phương nhỏ như nhau, bạn Việt xếp thành các chữ T, H, C như sau:</h4> <p><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/942-1661574340.png.webp" alt="hinh-anh-bai-14-khoi-lap-phuong-khoi-hop-chu-nhat-223-6" title="hinh-anh-bai-14-khoi-lap-phuong-khoi-hop-chu-nhat-223-6" loading="lazy">a) Chữ nào được xếp bởi nhiều khối lập phương nhất?</p><div class="google-auto-placed ap_container" style="width: 100%; height: auto; clear: both; text-align: center;"><ins data-ad-format="auto" class="adsbygoogle adsbygoogle-noablate" data-ad-client="ca-pub-8123786206223951" data-adsbygoogle-status="done" style="display: block; margin: auto; background-color: transparent; height: 0px;" data-ad-status="unfilled"><div id="aswift_4_host" tabindex="0" title="Advertisement" aria-label="Advertisement" style="border: none; height: 0px; width: 741px; margin: 0px; padding: 0px; position: relative; visibility: visible; background-color: transparent; display: inline-block; 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Các khối lập phương nhỏ như nhau được xếp thành các hình sau:</h4> <p><img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/951-1661574403.png.webp" width="655" height="202" alt="hinh-anh-bai-14-khoi-lap-phuong-khoi-hop-chu-nhat-223-7" title="hinh-anh-bai-14-khoi-lap-phuong-khoi-hop-chu-nhat-223-7" loading="lazy">Hình nào là khối lập phương?</p> <h4>4. Hình khối thích hợp đặt vào dấu "?" là hình nào?</h4> <p>a)<img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/952-1661574451.png.webp" alt="hinh-anh-bai-14-khoi-lap-phuong-khoi-hop-chu-nhat-223-8" title="hinh-anh-bai-14-khoi-lap-phuong-khoi-hop-chu-nhat-223-8" loading="lazy"></p> <p>b)<img style="display: block; margin-left: auto; margin-right: auto;" src="/uploads/tinymce/953-1661574461.png.webp" width="658" height="202" alt="hinh-anh-bai-14-khoi-lap-phuong-khoi-hop-chu-nhat-223-9" title="hinh-anh-bai-14-khoi-lap-phuong-khoi-hop-chu-nhat-223-9" loading="lazy"></p>