2⼀3+(1⼀4+3⼀8)= 9⼀13-(7⼀10-1⼀2)= 2⼀5+(5⼀6-2⼀3)=(全要递等式)

2025-01-07 15:47:55
推荐回答(1个)
回答1:

2/3+(1/4+3/8)
= 2/3+(2/8+3/8)
= 2/3+5/8
= 16/24+15/24
= 31/24

9/13-(7/10-1/2)
= 9/13-(7/10-5/10)
= 9/13-1/5
=45/65-13/65
=32/65

2/5+(5/6-2/3)
=2/5+(5/6-4/6)
=2/5+1/6
=12/30+5/30
=17/30