分式取值范围看化简前还是化简后如：No1.2/(x²-1)÷1/(x-1)化简后结果为2/(x+1).此式中x的取值范围是x≠±1还是x≠-1No2.(x²-2x)/(x-2)÷x化解后结果为1.此式中x取值范围是多少?

Question

分式取值范围看化简前还是化简后
如：No1.2/(x²-1)÷1/(x-1) 化简后结果为2/(x+1).此式中x的取值范围是x≠±1还是x≠-1
No2.(x²-2x)/(x-2)÷x 化解后结果为1.此式中x取值范围是多少?

Answer 1

看化简前.

x≠±1


x≠0且x≠2