a-b/ab=4,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 4ab/b^2(a-b)= a-b/ab=4,则a-2ab-b/2a-2b+7ab=? 已知（a-b）/ab=4,则a-2ab-b/2a-2b+7ab=? 如a-b=4,ab=1,则(2-ab+2a+5b)-(3ab+2b-2a)-(3a+4b-ab)= a+b/2ab 2AB/A+B a+b/2ab （a+ab)-[(ab-2b)-a]-(-9ab),其中a+b=-7,ab=3. 1/4a^2b^2{3ab(a+b)-5a(ab-b^2)}=? a>0,b>0,2a+b+ab=4,ab,2a+b最值 1/a+1/b=3则a-ab+b/a+2ab+b值是? ab/a+b=3 a-2ab+b/2a-3ab+2b? 2a²b(a-b)+ab(a-b)²+4ab²(a-b) ab+a+b+1-2ab=2ab,则a+b的值为? a^2+ab-b^2=0则（(a^2-b^2)/(b-a)(b-2a)）+(）2a^2-ab)/(4a^2-4ab+b^2)）*（(2a+b)/(2a-b)）求值 若a-b=4,ab=-2则2a^2b-2ab^2