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数学
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若实数x,y满足x平方+(y
若实数x,y满足x平方+(y-1)平方=1,且c>等于x+y恒成立,则c的取值范围是多少?
人气:200 ℃ 时间:2020-02-03 09:42:05
解答
x+y
=x+(y-1)+1
<=根号下{[x平方+(y-1)平方]/2}+1
=1+(根号2)/2
所以c>=1+(根号2)/2
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