数学计算题:(x的平方+x-2)分之(1-x)÷(x+2)分之(x的平方-1)
问题描述:
数学计算题:(x的平方+x-2)分之(1-x)÷(x+2)分之(x的平方-1)
答
=-(x-1)/(x+2)(x-1)×(x+2)/(x+1)(x-1)
=-1/(x+1)(x-1)
=-1/(x²-1)
=1/(1-x²)