1.若实数a,b满足0

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1.若实数a,b满足01.若实数a,b满足01.若实数a,b满足01.BAD先排除a^2+B^2-2ab=(a-b)^2>=0B>C,2.=(x^2+5)/(√x^2+4)=√x^2+4+1/(√x^

1.若实数a,b满足0
1.若实数a,b满足0

1.若实数a,b满足0
1.B AD先排除 a^2+B^2 -2ab=(a-b)^2>=0 B>C ,
2.=(x^2+5)/(√x^2+4)=√x^2+4 + 1/(√x^2+4) >=2

1:A
2:2.5

1.B
2.2.5

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