a^2b^2-6ab+9

（a+ab)-[(ab-2b)-a]-(-9ab),其中a+b=-7,ab=3. a^2b^2-6ab+9 a^2+6ab+9b^2 -a^2-9b^2+6ab a^2+9b^2+6ab (9a²-6ab+b²)/(3a²-ab),其中b/a=2 a^2b(a-b)-6ab(b-a), 计算(3a-2b)(9a*a+6ab+4b*b)-(3a+2b)(9a*a-6ab+4b*b) a+b/2ab 2AB/A+B a+b/2ab 因式分解：6ab^2-9a^2b-b^3 3(-2ab+3a)-(2a-b)+6ab 化简:(-2ab+3a)-(2a-b)+6ab -9a^3+12a^2b-6ab^2 a^3-6a^b+9ab^2分解因式 -2ab乘以(-a^+6a^b-3a+b) (a^2b-ab-a+1)/(ab^2+3ab-b-3)÷(a^2+a_2)/(b^2+b-6)