> 数学 >
xy-1+x-y用十字相乘法如何分解
人气:469 ℃ 时间:2020-10-02 00:21:36
解答
xy-1+x-y
=x(y+1)-(y+1)
=(y+1)(x-1)第一步是怎么得出来的xy-1+x-y =xy+x-1-y =x(y+1)-(y+1)=(y+1)(x-1)
推荐
猜你喜欢
© 2024 79432.Com All Rights Reserved.
电脑版|手机版