1.(1) 28.26 94.2 150.72 141.3 47.1
(2)56.52
(3)251.2
(4)25.12
2.12.56x4=50.24dm²
(12.56/3.14/2)²x3.14=12.56dm²
50.24+12.56=62.8dm²
答:需要62.8dm²
(2)(12.56/3.14/2)²x3.14x4=50.24dm²
答:能装水50.24千克 (注:1dm²=1kg)
3. 解:设圆柱体积为xdm³
x+1/3x=60
3/4x=60
x=45
答:圆柱体积是45dm³
4. 9x1/3=3dm
答:圆柱的高是3dm。
望采纳!
1:28.26 94.2 150.72 141.3 47.1 56.52 251.2 25.12
2:12.56*4+(12.56/3.14/2)平方*3.14=6.28dm2
(12.56/3.14/2)平方*3.14*4*1=50.24kg
3:60/(3+1)*3=45dm3
4:9*三分之一=3dm