2⼀7+1⼀2+2⼀7+1⼀2+8⼀5-(1⼀4+2⼀5)怎么算?

2024-11-29 11:22:12
推荐回答(5个)
回答1:

你好,这道题的简便算法如下:
2/7+1/2+2/7+1/2+8/5-(1/4+2/5)
=2/7+2/7+(1/2+1/2)+(8/5-2/5)-1/4
=4/7+1+6/5-1/4
=2又73/140
望采纳。

回答2:

简便计算
2/7+1/2+2/7+1/2+8/5-(1/4+2/5)
=(2/7+2/7)+(1/2+1/2)+(8/5-2/8)+1/4
=4/7+1+6/5+1/4
=2+(4/7+1/5+1/4)
=2+(80/140+28/140+35/140)
=2+143/120
=3又23/120

回答3:

原式=2/7+2/7+1/2+1/2-1/4+8/5-2/5
=4/7+1-1/4+6/5
=4/7+3/4+6/5
=80/140+105/140+168/140
=353/140

回答4:

回答5:

原式
=(2/7+2/7)+(1/2+1/2)+(8/5-2/8)+1/4
=4/7+1+6/5+1/4
=2+(4/7+1/5+1/4)
=2+(80/140+28/140+35/140)
=2+143/120
=3又23/120