Question

x加一分之一加x的平方减一分之x加三乘以x的平方加四x加三分之x减x的平方等于多少 要详细过程的

Answer 1

1/(X+1)+(X+3)/(X²-1)×(X-X²)/(X²+4X+3)

=1/(X+1)+(X+3)/(X-1)(X+1)×X(1-X)/(X+1)(X+3)

=1/(X+1)-X/(X+1)²

=1/(x+1)²

有疑问,请追问；若满意,请采纳,谢谢!