已知:ab≠0,a^2+2ab-3b^2=0,则2a-b/2a+b的值为_______.

问题描述:

已知:ab≠0,a^2+2ab-3b^2=0,则2a-b/2a+b的值为_______.
要有过程

(a+3b)(a-b)=0,即a=-3b或a=b
分别带入问题,得答案是:7/5或1/3