1-[(x-y)/(x+2y)]÷[(x+y)(x-y)/(x+2y)²]
来源:学生作业帮 编辑:搜搜做题作业网作业帮 分类:数学作业 时间:2024/07/22 21:28:17
1-[(x-y)/(x+2y)]÷[(x+y)(x-y)/(x+2y)²]
1-[(x-y)/(x+2y)]÷[(x+y)(x-y)/(x+2y)²]
=
1-[(x-y)/(x+2y)]÷[(x+y)(x-y)/(x+2y)²]
=
![1-[(x-y)/(x+2y)]÷[(x+y)(x-y)/(x+2y)²]](/uploads/image/z/19805949-45-9.jpg?t=1-%5B%28x-y%29%2F%28x%2B2y%29%5D%C3%B7%5B%28x%2By%29%28x-y%29%2F%28x%2B2y%29%26%23178%3B%5D)
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)
再问: 这100%正确吗?
再答: 嗯,是
=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)
再问: 这100%正确吗?
再答: 嗯,是