一个正方体棱长3分米,把它熔铸成一个圆柱,这个圆柱底面半径3分米,高多少分米?
3÷ ==0.75=6: = %
3÷ ==0.6=6: = %.
3:5==9: == .
=0.375=12÷ = %=0.45= %= ÷ .
= ÷ = = % ÷ =0.25== %