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a: Chiều rộng là 4/9*25,2=11,2(dm)
Chiều dài là 25,2-11,2=14(dm)
Chiều cao là 11,2*3/4=8,4(dm)
Sxq=50,4*8,4=423,36dm2=4,2336m2
b: V=11,2*14*8,4=1317,12dm3
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a)2,5lít=2500 cm khối=0,0025 m khối=2500ml
b)7,52lít=7520cc=0,00752 m khối
Để đầy bể thì chiều cao cần tăng thêm:
0,9-0,75=0,15m=1,5dm
Cần phải đổ thêm:
15*12*1,5=270(lít)
Đề bài sai mk xin sửa cho bạn :
1 dm3 = 1 lít = 1000 m3 = 0,001 cm3
Còn ml thì mk chưa biết
1L=1000ml ok