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()
答
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]