初二下学期数学的分式化简题化简:(x-4/x^2-1)÷(x^2-3x-4/(x+1)^2)+(1/x-1)难道你们也8会做

问题描述:

初二下学期数学的分式化简题
化简:
(x-4/x^2-1)÷(x^2-3x-4/(x+1)^2)+(1/x-1)
难道你们也8会做

si di

(x-4/x^2-1)÷(x^2-3x-4/(x+1)^2)+(1/x-1)
=[(x-4)/(x+1)(x-1)]*[(x+1)^2/(x-4)(x+1)]+1/(x-1)
=1/(x-1)+1/(x-1)
=2/(x-1)