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1-[(x-y)/(x+2y)]÷[(x+y)(x-y)/(x+2y)²]

分类: 作业答案 • 2022-01-09 18:02:39
问题描述：

1-[(x-y)/(x+2y)]÷[(x+y)(x-y)/(x+2y)²]
1-[(x-y)/(x+2y)]÷[(x+y)(x-y)/(x+2y)²]
=

答

1-[(x-y)/(x+2y)]÷[(x+y)(x-y)/(x+2y)²]
=1-[(x-y)/(x+2y)]×[(x+2y)²/(x+y)(x-y)]
=1-(x+2y)/(x+y)
=(x+y-x-2y)/(x+y)
=-y/(x+y)这100%正确吗?嗯，是

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