15.對于函數(shù)f (x)定義域中任意的x1.x2 (x1≠x2). 有如下結(jié)論:① f (x1+x2)=f (x1)• f (x2), ② f (x1•x2)=f (x1)+f (x2),③ >0, ④ f ()< 當(dāng)f (x)=lg x時(shí).上述結(jié)論中正確結(jié)論的序號是 查看更多

 

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對于函數(shù)f(x)定義域中任意的x1,x2x1x2),有如下結(jié)論:

 ①f(x1x2)=f(x1f(x2);② f(x1·x2)=f(x1)+f(x2)③>0;

.當(dāng)f(x)=lgx時(shí),上述結(jié)論中正確結(jié)論的序號是             .

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對于函數(shù)f(x)定義域中任意的x1x2(x1x2),有如下結(jié)論:

f(x1x2)=f(x1f(x2);

f(x1·x2)=f(x1)+f(x2);

>0;

f()<

當(dāng)f(x)=10x時(shí),上述結(jié)論中正確結(jié)論的序號是________

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對于函數(shù)f(x)定義域中任意的x1,x2(x1≠x2),有如下結(jié)論:

①f(x1+x2)=f(x1)·f(x2);

②f(x1·x2)=f(x1)+f(x2);

③(x1-x2)·[f(x1)-f(x2)]<0;

④f()<

當(dāng)f(x)=2-x時(shí),上述結(jié)論中正確結(jié)論的序號是________(寫出全部正確結(jié)論的序號)

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對于函數(shù)f(x)定義域中任意的x1,x2,且x1≠x2,有如下結(jié)論:

①f(x1+x2)=f(x1)f(x2);

②f(x1+x2)=f(x1)+f(x2);

>0;

④f()<

當(dāng)f(x)=2x時(shí),上述正確結(jié)論的序號是________.

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對于函數(shù)f(x)定義域中任意的x1,x2,且x1≠x2,有如下結(jié)論:

①f(x1+x2)=f(x1)f(x2);

②f(x1+x2)=f(x1)+f(x2);

>0;

④f()<

當(dāng)f(x)=2x時(shí),上述正確結(jié)論的序號是________.

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