若ab满足a^2+2b^2+1-2ab-2b=o,则a+2b=___
1个回答
a²+2b²+1-2ab-2b=0
(a²-2ab+b²)+(b²-2b+1)=0
(a-b)²+(b-1)²=0
所以
a=b=1
a+2b=3
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