求这几道初中计算题过程1/a+3-6/9-a^2(a/a-b-b/b-a) ·ab/a+b(1/x+1-x+3/x^2-1)/1/x-1[2/3a-2/a+b(a+b/3a-a-b)]/a-b/a

问题描述:

求这几道初中计算题过程
1/a+3-6/9-a^2
(a/a-b-b/b-a) ·ab/a+b
(1/x+1-x+3/x^2-1)/1/x-1
[2/3a-2/a+b(a+b/3a-a-b)]/a-b/a