若正实数x,y满足2x+y+6=xy,则xy的最小值是 .
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已知x,y∈R
+,且满足
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,则xy的最大值为
.
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若对任意x>0,
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≤a恒成立,则a的取值范围是
.
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设实数x,y满足3≤xy
2≤8,4≤
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≤9,则
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的最大值是
.
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若a>0,b>0,a+b=2,则下列不等式对一切满足条件的a,b恒成立的是
(写出所有正确命题的编号).
①ab≤1;
②
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;
③a
2+b
2≥2;
④a
3+b
3≥3;
⑤
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.
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已知x>0,y>0,x+2y+2xy=8,则x+2y的最小值是( )
A.3
B.4
C.
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D.
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