Question

người ta sử dụng 500 viên gạch hình vuông có cạnh 30cm để lát kín một phòng họp. Hỏi phòng họp đó có diện tích là bao nhiêu mét vuông?biết diện tích phần mạch vữa là không đáng kể

Answer 1

Diện tích viên gạch là: 30x4=120(cm)

Diện tích phòng học là : 120x500=60000(m2)

Answer 2

Diện tích 1 viên gạch: 30x30=600(cm2)

Diện tích phòng học: 600x500=300000(cm2)

Đ/s: 300000 cm2

Answer 3

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Answer 4

Trl

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