（x-4y）分之（3x)+(4y-x)分之（x+y）-（x-4y)分之（7y)

分类: 作业答案 • 2021-12-19 16:56:28

问题描述：

答

解:原式=3x/(x-4y)-(x+y)/(x-4y)-7y/(x-4y)
=(3x-x-y-7y)/(x-4y)
=(2x-8y)/(x-4y)
=2

答

=3x/(x-4y)-(x+y)/(x-4y)-7y/(x-4y)
=(3x-x-y-7y)/(x-4y)
=(2x-8y)/(x-4y)
=2(x-4y)/(x-4y)
=2