以下命题正确的是_____________.
①把函数

的图象向右平移
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个单位,得到

的图象;
②

的展开式中没有常数项;
③已知随机变量

~N(2,4),若P(

>

)= P(
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<
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),则

;
④若等差数列
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前n项和为

,则三点
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,(
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),(
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)共线.
试题分析:把函数

的图象向右平移

个单位,得

,即
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,①正确;

的展开式的通项公式为


(
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),令

=0,无解,②正确;由题意正态曲线关于

对称,且P(

>

)= P(

<

),则

,③错误;因为等差数列的前n项和为

,所以

,故点

在直线
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上,④正确.
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
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
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