括号里7⼀9+6分之5-3⼀4括起来乘以七分之二

括号里7/9+6分之5-3/4括起来乘以七分之二
2025-04-06 04:51:09
推荐回答(1个)
回答1:

(7/9+5/6-3/4)x2/7
=7/9x2/7+5/6x2/7-3/4x2/7
=2/9+5/21-3/14
=2/9+(10/42-9/42)
=2/9+1/42
=28/126+3/126
=31/126