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数学
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已知实数x、y满足x
2
+4xy+4y
2
+x+2y-6=0,则x+2y的值为______.
人气:322 ℃ 时间:2019-10-23 11:39:56
解答
x
2
+4xy+4y
2
+x+2y-6=0
(x+2y)
2
+(x+2y)-6=0
(x+2y+3)(x+2y-2)=0
∴x+2y+3=0,x+2y-2=0
即:x+2y=-3或2.
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