若ab=1,a-b=3,求ab+2b-2a
问题描述:
若ab=1,a-b=3,求ab+2b-2a
马上要用谢谢.
答
ab+2b-2a=ab-2(a-b)=1-2*3=-5
若ab=1,a-b=3,求ab+2b-2a
马上要用谢谢.
ab+2b-2a=ab-2(a-b)=1-2*3=-5