(x+1减1-x分之1)除以(x减x-1分之x的平方)
问题描述:
(x+1减1-x分之1)除以(x减x-1分之x的平方)
答
(x+1-1/(1-X))/(X-X^2/(X-1))
=(-X^2/(1-X))/(-X/(X-1))
=X