(X的平方-1)分之(X的3次方-3X的平方)*(X-3)分之(X+1)-(X-1)分之X
问题描述:
(X的平方-1)分之(X的3次方-3X的平方)*(X-3)分之(X+1)-(X-1)分之X
答
=x²(x-3)/(x+1)(x-1)×(x+1)/(x-3)-x/(x-1)
=x²/(x-1)-x/(x-1)
=(x²-x)/(x-1)
=x(x-1)/(x-1)
=x