1⼀3+1⼀5+7⼀30=?1-(7⼀9+3⼀4)=?5⼀7+5⼀14-3⼀5=?2⼀11-(2⼀3+2⼀11)=?5⼀7-X=1⼀4 一共5题,要过程,谢谢

2024-12-01 05:25:19
推荐回答(1个)
回答1:

1/3+1/5+7/30
=10/30+6/30+7/30
=23/30
1-(7/9+3/4)
=1-(28/36+27/36)
=1-55/36
=-19/36
5/7+5/14-3/5=50/70+25/70-42/70=33/70
2/11-(2/3+2/11)=2/11-2/3-2/11=-2/3
5/7-X=1/4
X=5/7-1/4
X=20/28-7/28
X=13/28