问题描述: a²+3b²-3a-3b=-3,则a=,b= 1个回答 分类:数学 2014-11-22 问题解答: 我来补答 a²+3b²-3a-3b=-3a²-3a+3b²-3b+3=0a²-3a+(3/2)²-(3/2)²+3(b²-b)+3=0a²-3a+(3/2)²-(3/2)²+3(b²-b+(1/2)²-(1/2)²)+3=0(a-3/2)² -9/4+3(b-1/2)²-3/4+3=0(a-3/2)² +3(b-1/2)²=0(a-3/2)=0 (b-1/2)=0则有a=3/2 b=1/2 展开全文阅读