先化简,再求值:(2a-b)^2-(a+b)(a-b)+(a+1)^2,三Q

问题描述:

先化简,再求值:(2a-b)^2-(a+b)(a-b)+(a+1)^2,三Q

原式=4a²-4ab+b²-a²+b²+a²+2a+1
=4a²-4ab+2b²+2a+1

=4a²-4ab+b²-(a²-b²)+a²+2a+1
=4a²-4ab+2b²+2a+1

(2a-b)^2-(a+b)(a-b)+(a+1)^2=(4a²-4ab+b²)-(a²-b²)+(a²+2a+1)=4a²-4ab+b²-a²+b²-a²-2a-1=2a²+2b²-4ab-2a-1很高兴为您解答,【the1900】团队为您答题....