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

问题描述:

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

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