已知实数x,y满足2x加y大于等于1,则u=x平方加y平方加4x减2y的最小值为?急
人气：413 ℃ 时间：2019-08-20 14:54:13
解答
2x+y≥1 u=x^2+y^2+4x-2y
=(x+2)^2+(y-1)^2-5
≥ 16/5-5=-9/5
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