要过程4/7÷9+3/7×1/9 [1-(1/8+0.25)]÷5/12=?
问题描述:
要过程4/7÷9+3/7×1/9 [1-(1/8+0.25)]÷5/12=?
答
4/7÷9+3/7×1/9
=4/7×1/9+3/7×1/9
=1/9×(4/7+3/7)
=1/9
[1-(1/8+0.25)]÷5/12
=(1-(1/8+1/4)]÷5/12
=(1-3/8)÷5/12
=5/8÷5/12
=3/2