> 数学 >
分式x+y分之x-y与(x+y)²分之x²-y²相等吗?
人气:278 ℃ 时间:2020-10-02 00:05:05
解答
相等.理由如下;
∵(x-y)/(x+y)
∴x+y≠0
∴(x-y)/(x+y)=[(x-y)(x+y)]/[(x+y)(x+y)]=(x²-y²)/(x+y)²
推荐
猜你喜欢
© 2026 79432.Com All Rights Reserved.
电脑版|手机版