(b-a)÷AB=2,则(A-2AB-B)÷(2A-2B+7AB)=?

(b-a)÷AB=2,则(A-2AB-B)÷(2A-2B+7AB)=? 若a/b=2 则a*a-ab+b*b/a*a+b*b等于? 如果a/b=2则a*a-ab+b*b/a*a+b*b求值 （a+ab)-[(ab-2b)-a]-(-9ab),其中a+b=-7,ab=3. a+b/2ab 2AB/A+B a+b/2ab 计算(a+b)/(ab-b^2)÷(ab+b^2)/(a-b)^2= ab+a+b+1-2ab=2ab,则a+b的值为? 1/a+1/b=3则a-ab+b/a+2ab+b值是? ab/a+b=3 a-2ab+b/2a-3ab+2b? a^2-3ab+b^2/ab=( )/ab-3 a^2-3ab+b^2/ab=( )/ab -3 a(a-1)-(a×a-b)=-5,求(a×a+b×b)÷2-ab 已知a+b=3ab,求代数式(5a+ab+5b)÷(a-2ab+b)的值. A-B=-1,AB=-2,则(2A-3B-AB)-(A-2B+3AB)=?” 若a-b=3ab,则2a-ab-2b/a+2ab-b=? a-b/ab=4,则a-2ab-b/2a-2b+7ab=?