(2a-b+1)*(2a-b-1)-(a+2b)*(a-b),其中a,b满足(a+b-3)的绝对值+(ab+2)^2=0

问题描述:

(2a-b+1)*(2a-b-1)-(a+2b)*(a-b),其中a,b满足(a+b-3)的绝对值+(ab+2)^2=0

化简:(2a-b+1)*(2a-b-1)-(a+2b)*(a-b)=(2a-b)²-1-(a²-ab+2ab-2b²)=4a²+b²-4ab-1-a²-ab+2b²=3a²+3b²-5ab-1又∵a,b满足(a+b-3)的绝对值+(ab+2)^2=0(a+b-3)的绝对值...