把4个同样大小的圆柱,熔铸成等底等高的圆锥,能熔铸 个.
2÷ =8: =0.75= %= .
20%= ÷40=40: = [填小数]=× .
÷12===10÷( )=.
= %=12÷ =9: =.
÷ == :16= 小数.