已知a^2+b^2-4a+6b=负13求a.b值
人气：168 ℃ 时间：2020-05-21 23:32:07
解答
a²+b²-4a+6b=-13
(a²-4a+4)+(b²+6b+9)=0
(a-2)²+(b+3)²=0
∴{a-2=0
b+3=0
∴a=2,b=-3
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