1-2⼀5+3⼀7 7⼀10-(1⼀2-1⼀3) 11⼀12-(3⼀4-7⼀30) 这些都是简算

2024-11-02 14:46:45
推荐回答(1个)
回答1:

1-2/5+3/7
=3/5+3/7
=3×(1/5+1/7)
=3×12/35
=36/35

7/衡斗薯10-(1/2-1/3)
=7/10-1/2+1/3
=1/5-1/3
=2/15

11/12-(3/4-7/咐者30)
=11/12-3/销嫌4+7/30
=1/6+7/30
=2/5