（a+b\a-b)方*2a-2b\3a+3b-a方\a方-b方/a\b要全过程

（a+b\a-b)方*2a-2b\3a+3b-a方\a方-b方/a\b要全过程
（a+b\a-b)方*2a-2b\3a+3b-a方\a方-b方/a\b要全过程

（a+b\a-b)方*2a-2b\3a+3b-a方\a方-b方/a\b要全过程
[(a+b)/(a-b)]^2*[(2a-2b)/(3a+3b)]-[a^2/(a^2-b^2)]/(a/b) =2(a+b)^2*(a-b)/[3(a-b)^2*(a+b)]-a^2b/[a(a+b)(a-b)] =2(a+b)/[3(a-b)]-ab/[(a+b)(a-b)] =2(a+b)^2/[3(a+b)(a-b)]-3ab/[3(a+b)(a-b)] =(2a^2+2b^2+4ab-3ab)/[3(a+b)(a-b)] =(2a^2+2b^2+ab)/[3(a^2-b^2)]