2014·吉林延边·一模
1 . 给出下列命题:
① 已知线性回归方程
,当变量
增加2个单位,其预报值平均增加4个单位;
② 在进制计算中,
;
③ 若
,且
,则
;
④ “
”是“函数
的最小正周期为4”的充要条件;
⑤ 设函数
的最大值为
,最小值为
,则
,其中正确命题的个数是_____ 个.
① 已知线性回归方程
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a8a20de7a89ee822d3e55db1205cef1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
② 在进制计算中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af280af38c22664f9d5f40b4e744cbce.png)
③ 若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f26c9847f64cb2eabc3169da3a9a77b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e48e6198b198b7849ad07e302904624.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/970ea9725d9a57fb2067466572fe14b8.png)
④ “
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a734f854471a10191113b566995c3f29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/830ae6e08aace1868f5dc436b423cdb1.png)
⑤ 设函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828cac1782ab980387f39570048b9df7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca4f22e4c6004397d5d3ea80ce3f92b7.png)
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