a+2ab+b/2a-3ab+2b怎么化简?

5(3a^2b-ab^2)-(ab^2+3a^2b)怎么化简 a+2ab+b/2a-3ab+2b怎么化简? b^2+ab分之a^2+ab怎么化简? a+b/2ab 2AB/A+B 化简求值-ab*(a^2b^5-ab^3-b),其中ab^2=-2 分式化简 b/(a^2-ab)+2/(b-a)-a/(b^2-ab) a²-b²/a²-3ab+2b² 怎么化简 已知a^2+ab+b^2|ab(a+b),求证(a-b)^3>3ab 因式分解a^+b^+2a^b+2ab^+a^+b^+3ab+a+b 若a>0 b>0怎么证明2ab/(a+b)《根号ab《(a+b)/2? a^2b-ab+2ab^2-5a^b-4ab+3ab^2化简快