已知
,定义
,
,…
,(
),经计算,
,
,
,…,照此规律,
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dff8704285d8c14ae2bd82f9196501c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6fc51ae6ba348d0e4d3765a4818406e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d9b798c38839c3d34aca6dd7355e272.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5f6dedac9c03308710efc897c553be4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cea4ac187cbb465180e89f38250b3970.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3aa3093eef0143fd4172aefc19c53caa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/297d2858d9577494e604929b00d02e17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee4919e9d9527f619298d5b5c2bf643f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47b2380689ed1b5a5599ba4b5f0f40f4.png)
A.![]() | B.![]() | C.![]() | D.![]() |
更新时间:2020-04-24 10:11:02
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解题方法
【推荐1】幂指函数
在求导时,可运用对数法:在函数解析式两边求对数得
,两边同时求导得
,于是
,运用此方法求得函数
在以下哪个区间递增
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e13e554ecadd50199d918dbf3727126.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1674667c2dbd8931bb6c4fffb42a22a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5de8ae2f25c24c4c0ea716576a950868.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6458dc3bebbc0c4d6ec96ea451fa2fd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d055831912dc535a3c799b6de007ec02.png)
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【推荐1】把非零自然数按-定的规则排成了下面所示的三角形数表(每行比上一行多一个数),设
是位于这个三角形数表中从上往下数第
行,从左往右数第
个数,如
,若
,
,则
的值为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c855332a7131de7dd8ad8a58b69586b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c94365f311dc0185773b549d2b2dfd4b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c05b9832b09731a574d4a4adf7448de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43366cf92d2bbd350b6f2dcc9e14d712.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bddcfb85262b12536411ec566926838b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef178c4320412a41a6592d5e0a833bf8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37a14c188b1c9d61aa237b137ba18023.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c855332a7131de7dd8ad8a58b69586b8.png)
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【推荐2】已知
,
,
,…,依此规律可以得到的第
个式子为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1db1c8f88c5de20586db0cde44d3e28.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1d4fd766978103211c9ba193587d560.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b7df6acbe5e9618d14d66cad2bbceaa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6a24198bd04c29321ae5dc5a28fe421.png)
A.![]() |
B.![]() |
C.![]() |
D.![]() |
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