A, để cắt tấm tôn hình chữ nhật có chiều dài 1,4m , rộng 0,9m thành các mảnh tôn nhỏ hình chữ nhật. Theo con chú cần cắt thành các mảnh tôn nào dưới đây để ko phải bỏ đi miếng tôn nhỏ nào (70cm×30cm;15cm×25cm;20cm×30cm;40cm×20cm) - chú thợ nên cắt thành các mảnh tôn nhỏ có kích thuơcs là : ......... B, với cách cắt đã chọn ở phần a, để gò đủ 21 chiếc hộp chú thợ cần......tấm tôn, biết mỗi hộp cần 2 mảnh tôn. Điền giúp e chỗ ba chấm vs ạ ai giải đầu tiên e đánh giá luôn 5 sao ạ

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