1 . 设
是非负实数,且
.则
的最大值是______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84821cc550165e04ddb1580b8925044c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32a3cc56ce1c794d8d8701c0405bf866.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7291f08c270e410218d3276eff58697.png)
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2 . 九个正实数
构成等比数列,且
,
则
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c699569b5707bf17cca6c9c7b2a82659.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdd47f26603b8aa26d2f467cba8eb9f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a66aa73d3bc1eff7ef0111bb161efef3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2902ccdb45bcff19bafad8bfc1b32e3.png)
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3 . 在图所示的数阵中,每行的三个数依次成等差数列,每列的三个数也依次成等差数列.若
,则所有这九个数的和等于______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31606ac5661e2707b7615cd65efca7e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d537d58c1657629b053368830666779.png)
您最近一年使用:0次
4 . 在等差数列
中,若
,且其前
项和
有最大值.则当
取最小正值时,
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbfc09e305f5528f623a126506e770b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08eb71ecf8d733b6932f4680874dbbf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3cb8d72bb2e281b943b3b430138ef7.png)
A.1 | B.10 | C.19 | D.20 |
您最近一年使用:0次
5 . 已知数列
满足:
,
,
.则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc00c62f5dda3fb46d69c9f1a8027de4.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/039e4fe671d61e59b96ee525c9df43e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f966272f7781790ff27e40db6b525253.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d983de2be935fe91d013e7e0cac54123.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc00c62f5dda3fb46d69c9f1a8027de4.png)
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6 . 对于
,计算![](https://staticzujuan.xkw.com/quesimg/Upload/formula/038d0c90a4f859961f3277322ef43de5.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29d5ec9ad92f37e64eccce922ab1b14e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/038d0c90a4f859961f3277322ef43de5.png)
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7 . 已知数列
满足
,
.则
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83cf38189d5cbf627d2b82ac0eb76006.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1bae03ee4ac75dacfb026290e4207dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/998224a1d74722ad73344e0da4d8354e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07f0a319cd059109e55181512b96ac40.png)
A.4036080 | B.4036078 | C.4036082 | D.4036099 |
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8 . 若十进制三位数
满足
、
、
成等差数列,则
的质因子的最大可能值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/625700f50900b20fd8c33dab7b0402c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
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9 . 等差数列
共有
项
,其中, 所有奇数项之和为 310 ,所有偶数项之和为 300 .则
的值为.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad4546b288340a9393260ed532171518.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2def5aa62f497709e1bd8258583d62fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4deeb1d48ba9103bd939d129bbcabf00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
A.30 | B.31 | C.60 | D.61 |
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