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i do not know sory ma tan lop may vay
a) diện tích đáy hồ hình hộp cn là: \(20.10=200\left(m^2\right)\)
diện tích xung quanh lòng hồ là: \(\left(20+10\right).2.1,2=72\left(m^2\right)\\\)
diện tích phần lát gạch là: \(200+71=271\left(m^2\right)\)
b) diện tích 1 viên gạch men là:\(2.2=4\left(dm^2\right)=0,04\left(m^2\right)\)
số gạch cần mua là: \(272:0,04=6800\left(viên\right)\)
sai chỗ này bạn ơi
diện tích phần lát gạch là:
Đáng lẽ ra là 200 + 72 = 272 chứ
có ai biết ko
404 chắc chắn với bn lun
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