8×75%-3÷3/4
=8×3/4-4
=6-4
=2

8.5×0.75＋7.5×75%
=8.5×0.75＋7.5×0.75
=0.75×（8.5+7.5）
=3/4×16
=12

5/8-5/6×（1/4－25%）
=5/8-5/6×（1/4-1/4）
=5/8-5/6×0
=5/8-0
=5/8

如果帮到你,请记得采纳,O(∩_∩)O谢谢8×75%-3÷3/4 =8×3/4-4=6-4=2为什么要减43÷3/4=1÷1/4=4