(3a+b)(3a-b) (-1/2a-b) (3y+2x)^2 (3ab+2b)^2 -8a^4b^/6ab^2 (3x^2y-xy^2+1/2xy)/(-1/2xy) 对了追40
(3a+b)(3a-b) 空 (-1/2a-b) （1/2a-b)空 (3y+2x)^2空 (3ab+2b)^2空 -8a^4b^/6ab^2空(3x^2y-xy^2+1/2xy)/(-1/2xy）上面错了 急求对了追40