1 . 计算:
(1)
;
(2)
.
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a79987e61f1744f170e36b2278dcb94.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54c2263a6d8eb7f988dd1cd57c524d62.png)
您最近一年使用:0次
2 . 一种放射性物质不断变化为其他物质,每经过一年,剩余质量约是原来的75%.经过多少年,该物质的剩余质量是原来的
?(
,
,结果精确到0.001)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/282724a3b2b45f1966a91389fdcedfcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09e5aecc7c32f46bc083030629cdd81a.png)
您最近一年使用:0次
3 . 求值:
(1)
;
(2)
;
(3)
;
(4)
;
(5)
;
(6)
;
(7)
;
(8)
.
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/738f315a3d366fec9eae6597cda3d625.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57c08dce84166f81e44ab85603bf7033.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/608dc60f6d3a978701060e4a5d716357.png)
(4)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/054e3da8fd8803b042e5f13beb8ac16e.png)
(5)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f30db5859c8a105ca354310bb396a085.png)
(6)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6f8e5d7a8082a7077d1633ae86eed55.png)
(7)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ae38427793c44fabd9b7531aabd626c.png)
(8)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d68d0c7834f382482c5f8ca5bcd252c7.png)
您最近一年使用:0次
4 . 已知
,
,请用a,b表示下列各数的值:
(1)
;
(2)
;
(3)
;
(4)
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a08a2a5540efcdb5a77aa4ea3049884.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/850df3e299d9b1ecbda7e3a59e2a255e.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/930f7706c8f0a021d2e81f1cba24cca0.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ede9f9b1dbd9fd7245f8d032fe1f083d.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e7613e04019ca879f8269196d0c3527.png)
(4)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ed4bed77efc425c51335b4c64761237.png)
您最近一年使用:0次
2023-10-09更新
|
249次组卷
|
4卷引用:习题 4-2
(已下线)习题 4-2北师大版(2019)必修第一册课本习题 习题4-2(已下线)2.2换底公式-同步精品课堂(北师大版2019必修第一册)【导学案】2.2 换底公式课前预习-北师大版2019必修第一册第四章对数运算与对数函数
5 . 求下列各式中x的值:
(1)
;
(2)
;
(3)
;
(4)
.
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c1ddf7a390ca651fd2636f94b1e541d.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b9b192d7e8161e25e48292e093b3484.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d235ee649ceccb9a8d89ad7f93df8e95.png)
(4)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78ed170fdb5c8279d9def2ff3813cf25.png)
您最近一年使用:0次
6 . 求值:
(1)
;
(2)
;
(3)
;
(4)
;
(5)
;
(6)
;
(7)
;
(8)
.
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c806fb25495ec94cd303871cec4c36d.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5559ddc6591d0673419a6876e75b476.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a7a8ca9cb5ac9915fffdcd12924c581.png)
(4)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76220bb578e871c7dba4f8b853f73764.png)
(5)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/004059979afc03b36b9392d037e8a667.png)
(6)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/875a17caae550b5631ece3345a0c25a4.png)
(7)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5be6de2c4e7230d99faf49c68ab9bbb8.png)
(8)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c2ee362f4eff093869661fd6313f143.png)
您最近一年使用:0次
7 . 判断下列结论是否正确:
(1)若
,则
;
(2)若
,则
;
(3)
;
(4)
;
(5)
.
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/263ea8601828cb0fa20e0e2ce32ce65f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39cc033406da2cdd342308972c6701f1.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e3cc614daa9bfdc18893a84c637cb82.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a945357aa4d7cb2bd48c28af862a3078.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d53f44d3cb5e9c3353121cc0394c3a0a.png)
(4)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e580ee5e5d0931f6aa849741d96d8c41.png)
(5)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ab81a86cf0b464e000d084498a5c473.png)
您最近一年使用:0次
2023-10-09更新
|
97次组卷
|
3卷引用:习题 4-2
解题方法
8 . 判定下列方程存在几个实数根,并分别给出每个解的存在区间:
(1)
;
(2)
.
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99606defee81cacc6652482953b6818c.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/811f9e6a966be78c9f2bb8a3d0dc687b.png)
您最近一年使用:0次
9 . 已知
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a5e0c6462e32865cc17c0364457fc4d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
您最近一年使用:0次
10 . 求值:
(1)
;
(2)
;
(3)
;
(4)
;
(5)
;
(6)
.
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b101f5ecc3f1e2556595373a9eb0bfd4.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fbdc8295e6bf4728ddeb0d5253ac6b9.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2945785f9e33199199ea51162f98f0e7.png)
(4)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/766ac0b3d9c427ac65362bfe95b70fb0.png)
(5)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4bb3dd30eba0d7a7e0d2f13abe98de8.png)
(6)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/192e30cf9e30fabd3b16db511898f779.png)
您最近一年使用:0次
2023-10-08更新
|
511次组卷
|
3卷引用:习题 4-1