Question

x+1分之1-x的平方-1分之1乘以x+1分之x的平方-2x+1

Answer 1

(x+1)分之1-(x²-1)分之1×(x+1)分之(x²-2x+1)

=(x+1)分之1-[(x+1)(x-1)]分之1×(x+1)分之(x-1)²

=(x+1)分之1-(x+1)²分之(x-1)

=(x+1)²分之(x+1)-(x+1)²分之(x-1)

=(x+1)²分之[(x+1)-(x-1)]

=(x+1)²分之2