(1)當(dāng)x1 = x2時(shí).直線OA.OB的斜率分別為±1.解方程組得x =±. 查看更多

 

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以下結(jié)論正確的有
②③⑤
②③⑤
(寫出所有正確結(jié)論的序號(hào))
①函數(shù)y=
1
x
在(-∞,0)∪(0,+∞)上是減函數(shù);
②對(duì)于函數(shù)f(x)=-x2+1,當(dāng)x1≠x2時(shí),都有
f(x1)+f(x2)
2
<f(
x1+x2
2
)

③已知冪函數(shù)的圖象過(guò)點(diǎn)(2,2
3
5
)
,則當(dāng)x>1時(shí),該函數(shù)的圖象始終在直線y=x的下方;
④奇函數(shù)的圖象必過(guò)坐標(biāo)原點(diǎn);
⑤函數(shù)f(x)對(duì)任意實(shí)數(shù)x,y,都有f(x+y)=f(x)+f(y)-1,且當(dāng)x<0時(shí),f(x)<1,則f(x)在R上為增函數(shù).

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以下結(jié)論正確的有
②③
②③
(寫出所有正確結(jié)論的序號(hào))
①函數(shù)y=
1
x
在(-∞,0)∪(0,+∞)上是減函數(shù);
②對(duì)于函數(shù)f(x)=-x2+1,當(dāng)x1≠x2時(shí),都有
f(x1)+f(x2)
2
<f(
x1+x2
2
);
③已知冪函數(shù)的圖象過(guò)點(diǎn)(2,2 
3
5
),則當(dāng)x>1時(shí),該函數(shù)的圖象始終在直線y=x的下方;
④奇函數(shù)的圖象必過(guò)坐標(biāo)原點(diǎn).

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下列敘述
①對(duì)于函數(shù)f(x)=-x2+1,當(dāng)x1≠x2時(shí),都有
f(x1)+f(x2)
2
<f(
x1+x2
2
);
②設(shè)f(x)=
1+x2
1-x2
則f(2)+f(3)+…+f(2012)+f(
1
2
)+f(
1
3
)+…+f(
1
2012
)=0;
③定義域是R的函數(shù)y=f(x)在[a,b)上遞增,且在[b,c]上也遞增,則f(x)在[a,c]上遞增;
④設(shè)滿足3x=5y的點(diǎn)P為(x,y),則點(diǎn)P(x,y)滿足xy≥0.
其中正確的所有番號(hào)是:
①②④
①②④

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以下結(jié)論正確的有______(寫出所有正確結(jié)論的序號(hào))
①函數(shù)y=
1
x
在(-∞,0)∪(0,+∞)上是減函數(shù);
②對(duì)于函數(shù)f(x)=-x2+1,當(dāng)x1≠x2時(shí),都有
f(x1)+f(x2)
2
<f(
x1+x2
2
)
;
③已知冪函數(shù)的圖象過(guò)點(diǎn)(2,2
3
5
)
,則當(dāng)x>1時(shí),該函數(shù)的圖象始終在直線y=x的下方;
④奇函數(shù)的圖象必過(guò)坐標(biāo)原點(diǎn);
⑤函數(shù)f(x)對(duì)任意實(shí)數(shù)x,y,都有f(x+y)=f(x)+f(y)-1,且當(dāng)x<0時(shí),f(x)<1,則f(x)在R上為增函數(shù).

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以下結(jié)論正確的有    (寫出所有正確結(jié)論的序號(hào))
①函數(shù)在(-∞,0)∪(0,+∞)上是減函數(shù);
②對(duì)于函數(shù)f(x)=-x2+1,當(dāng)x1≠x2時(shí),都有
③已知冪函數(shù)的圖象過(guò)點(diǎn),則當(dāng)x>1時(shí),該函數(shù)的圖象始終在直線y=x的下方;
④奇函數(shù)的圖象必過(guò)坐標(biāo)原點(diǎn);
⑤函數(shù)f(x)對(duì)任意實(shí)數(shù)x,y,都有f(x+y)=f(x)+f(y)-1,且當(dāng)x<0時(shí),f(x)<1,則f(x)在R上為增函數(shù).

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