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

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

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

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