已知a²+b²+2a-4b+5=0,求(a-2b)²+(a+2b)²
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已知a²+b²+2a-4b+5=0,求(a-2b)²+(a+2b)²
已知a²+b²+2a-4b+5=0,求(a-2b)²+(a+2b)²
已知a²+b²+2a-4b+5=0,求(a-2b)²+(a+2b)²
a²+b²+2a-4b+5=0
(a²+2a+1)+(b²-4b+4)=0
(a+1)²+(b-2)²=0
a=-1 b=2
(a-2b)²+(a+2b)²
=a²-4ab+4b²+a²+4ab+4b²
=2a²+8b²
=2x(-1)²+8x2²
=2+32
=34
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