化简ab-[3a^2b-(2/3ab+4a^2b)]-(2ab+a^2b)化简(3a-2b)(2b+3a)-（2a-3b）^2

a^2b-ab+2ab^2-5a^b-4ab+3ab^2化简快 化简 3a²-[2ab-2(ab-3/2a²b)+ab]+4ab² 化简:(-2ab+3a)-(2a-b)+6ab 合并同类项5a²b-3ab-4ab²+7ab-2ab² a^2-3ab+b^2/ab=( )/ab-3 a^2-3ab+b^2/ab=( )/ab -3 化简ab－2{ab－[3a²b－(4ab²＋2/1ab)－3a²b]}－3ab² 5ab^2-{2a^b-[3ab^2-(4ab^2-2a^2b)]} 化简 a^2-ab^2/ab+3b^2= 5ab^2-{2a^2b-[3ab^2-(4ab^2-2a^2b]}化简 化简:5(3a^2b-ab^2)-4(-ab^2+3a^2b) 3a²b-[2ab²-6(ab-1/2a²b)+4ab]-2ab 化简[(a-b)/(a+2b)]/[(a^2-b^2)/(a^2+4ab+b^2)]-(3a^2-4ab)/(a^2+ab) 化简：a-(3ab+b)+(3a-4b-ab) 3ab{(-2ab)平方-3b(ab-a平方b)+ab平方}算出来多少Rt 计算：2ab[(2ab)²-3b(ab+a²b)-ab²] ab/a+b=3 a-2ab+b/2a-3ab+2b? 1/4a^2b^2{3ab(a+b)-5a(ab-b^2)}=?