Question

先化简再求值,x+1分之2x-x的平方-1分之2x+6÷x的平方-2x+1分之x+3？

Answer 1

猜2x/(x+1)-(2x+6)/(x^2-1)÷(x+3)/(x^2-2x+1)

=2x/(x+1)-2(x+3)/[(x-1)(x+1)]×(x-1)^2/(x+3)
=2x/(x+1)-2(x-1)/(x+1)
=2/(x+1).

Answer 2

拍照上传！你描述的太乱。
总之，
x²-1=（x+1）（x-1）
x²-2x+1=（x-1）²
它们跟(x+1) 通分、化简……