> 数学 >
数学计算题:(x的平方+x-2)分之(1-x)÷(x+2)分之(x的平方-1)
人气:333 ℃ 时间:2020-01-25 11:05:23
解答
=-(x-1)/(x+2)(x-1)×(x+2)/(x+1)(x-1)
=-1/(x+1)(x-1)
=-1/(x²-1)
=1/(1-x²)
推荐
猜你喜欢
© 2024 79432.Com All Rights Reserved.
电脑版|手机版