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数学
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a2+b2 -2a+4b+5=0 求a和b的值
人气：104 ℃ 时间：2019-12-13 16:59:52
解答
a^+b^-2a+4b+5=0
a^-2a+1+b^+4b+4=0
(a-1)^2+(b+2)^2=0
则a-1=0, a=1
b+2=0,b=-2
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