整体去括号；化简[5(x-y)-3(x-y)-(x-y)+2(x-y)]-2(x-y)_数学解答

整体去括号；化简[5(x-y)-3(x-y)-(x-y)+2(x-y)]-2(x-y)

人气：212 ℃　时间：2020-05-22 04:29:26

解答

[5(x-y)-3(x-y)-(x-y)+2(x-y)]-2(x-y)
=（5-3-1+2）（x-y）-2（x-y)=（3-2）（x-y)=x-y中间是什么？不懂