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1.已知正实数a,b,满足,则( )
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2.已知正实数a,b,满足,则( )
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3.已知实数a,b满足a2 a=3b2 2b,且a,b>0,则(C a2b
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4.已知实数a,b满足a2 a=3b2 2b,且a,b>0,则(C a2b
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5.已知实数a满足 |23-a| =a,则a-23 2 的值是多少?
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6.已知实数x,y,满足:,
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7.已知实数a,b满足 |a|<2,|b|<2,证明:2|a b|<|4 ab|.
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8.已知实数a,b满足a 2b=1,则2a 4b的最小值是 A.2 B.2 C.4 D.4
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9.已知实数a,b分别满足a 2 ﹣6a 4=0,b 2 ﹣6b 4=0,则 的值是________.
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10.已知实数a,b满足1≤a b≤3且-1≤a-b≤1,则4a 2b的取值范围为______.