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a. DIện tích đáy bề là : \(10\times20=200m^2\)
Diện tích thành bể là : \(1,2\times2\times\left(10+20\right)=72m^2\)
Diện tích cần lát gạch là 200+ 72 =272 mét vuông
b. DIện tích một viên gạch là : \(0,2\times0,2=0,04m^2\)
Số viên gạch cần tới là : \(272:0.04=6800\text{ viên}\)
404 chắc chắn với bn lun
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a, Diện tích đáy hồ bơi:
20 x 10= 200(m2)
Diện tích xung quanh hồ bơi:
2 x 1,2 x (20+10)= 72(m2)
Diện tích phần lát gạch:
200+72= 272(m2)
b, Diện tích 1 viên gạch:
2 x 2= 4(dm2)=0,04(m2)
Số viên gạch cần mua để lát:
272:0,04= 6800(viên)
Cần 5120 viên
minh nho la 5120 moi phai