题目

((3x-7)^2-(x+5)^2)/(4x-24).2,((x^2+1)^2-4x(x^2+1)+4x^2)/(x-1)^2 计算
((3x-7)^2-(x+5)^2)/(4x-24).2,((x^2+1)^2-4x(x^2+1)+4x^2)/(x-1)^2 计算 急

提问时间：2020-08-07

答案

((3x-7)^2-(x+5)^2)/(4x-24).=(3x-7+x+5)(3x-7-x-5)/(4x-24)=(4x-2)(2x-12)/(4x-24)=4(2x-1)(x-6)/4(x-6)=2x-1((x^2+1)^2-4x(x^2+1)+4x^2)/(x-1)^2=[(x^2+1)-2]^2/(x-1)^2=(x^2-1)^2/(x-1)^2=(x-1)^2(x+1)^2/(x-1)^2...