一.化简.5(a+b)²-3(2a+3b)-3(a+b)²+(2a+3b)二.已知(x-6)²+|y+1|=0,求﹙﹣x+2y/3﹚-2/3(x+1/2y)的值

问题描述:

一.化简.5(a+b)²-3(2a+3b)-3(a+b)²+(2a+3b)
二.已知(x-6)²+|y+1|=0,求﹙﹣x+2y/3﹚-2/3(x+1/2y)的值