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nguyenduyluan
2 năm trước
Mỗi bài 10 đ nhé Bài 1: Người ta sơn 1 cái thúng không nắp dạng hình hộp chữ nhật có chiều rông bằng 4,5 dm. Chiều dài gấp đôi chiều rộng, chiều cao 2,3 m. Tính diện tích phần quét sơn? Bài 2: 1 mảnh đất hình chữ nhật có chiều rộng là 2m và chiều dài là 5 m. Người ta dành 40% diện tích làm nhà 15% diện tích làm vườn. Tính diện tích đất để làm nhà, làm vườn? Bài 3: tính DT xung quanh Và DT toàn phần của hình hộp chữ nhật a = 22cm b= 10cm h = 5,5 cm
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