已知A-B-3AB=3.则分式A-B-6AB/2A-2B+3AB的值()

问题描述:

已知A-B-3AB=3.则分式A-B-6AB/2A-2B+3AB的值()

A-B-3AB=3.则A-B=3+3AB
分式A-B-6AB/2A-2B+3AB
=[3+3AB-6AB]/[2(3+3AB)+3AB]
=[3-3AB]/[6+9AB]