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已知函数f(x)=-log2x,正实数a,b,c是公差为正数的等差数列,且满足f...
已知函数f(x)=
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-log
2x,正实数a,b,c是公差为正数的等差数列,且满足f(a)f(b)f(c)<0.若实数d是方程f(x)=0的一个解,那么下列四个判断:①d<a;②d<b;③d<c;④d>c中有可能成立的个数为( )
A.1
B.2
C.3
D.4
考点分析:
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