MARS2000
春芽
共回答了22个问题采纳率:86.4% 举报
中间那个12分之51是不是打错了?你再检查一下!
先做几道,给你点启发吧:
7/8 - 1/3 - 5/12
=7/8 - (1/3 + 5/12)
=7/8 - (4/12 + 5/12)
=7/8 - 9/12
=7/8 - 3/4
=7/8 - 6/8
=1/8
1 - 1/10 - 9/10
=1 - (1/10 + 9/10)
=1 - 1
=0
2.5×3.6+6.4×2.5
=2.5×(3.6+6.4)
=2.5×10
=25
(14.7+7.7)÷7
=14.7÷7 + 7.7÷7
=2.1 + 1.1
=3.2
1年前
6