1.能简便的要简便[3分之5-55%-(35%+3分之2)]除以5分之2列式计算1.一个数的40％比这个数的60％少28

[5/3-55%-(35%+2/3)]/(2/5)
=[(5/3-2/3)-(55%+35%)]/(2/5)
=[1-80%]/(2/5)
=(1/5)/(2/5)
=1/2
28/(60%-40%)
3-(1/7)*(3/4)