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

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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

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
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

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
(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

1/(x+1)-(x+3)/(x²-1)*(x²-2x+1)/(x²+4x+3)
=1/(x+1)-(x-1)²/((x+1)(x-1))*(x+3)/((x+3)(x+1))
=1/(x+1)-(x-1)/(x+1)*1/(x+1)
=(x+1)/(x+1)²-(x-1)/(x+1)²
=(x+1-x+1)/(x+1)²
=2/(x+1)²