(1)计算:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6866353fb582ddb5a75daf2ebf6b6c2.png)
(2)已知
,
,又
,若
恒成立,求正实数
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6866353fb582ddb5a75daf2ebf6b6c2.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08115d6d9f876dea921a4d32260ff1fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/061813f1ec633c5c4c393c4de7938322.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5558c083d34cbb0a58d3ce1dc6f5778e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5adb2722ea0369ed0df35e1d51d5aad3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
更新时间:2023-09-29 00:32:50
|
相似题推荐
解答题-问答题
|
适中
(0.65)
【推荐1】今年上半年新冠肺炎全球大爆发.在某个时间点,某城市每周新增发病人数
(单位:千人)与时间t(单位:周)之间近似满足
,该城市从有人发病到发现人传人时,已有发病人数
(千人),且当
时,
(千人).从第3周后,该城市采取封城的隔离措施,再经过两周之后,隔离措施产生效果,新增发病人数
.
(Ⅰ)求该城市第5,6,7周新增发病人数;
(Ⅱ)随着该城市不断加大科研投入,治愈人数
(单位:千人)与时间t(单位:周)存在关系
,为保障每一位新增病人能及时入院治疗,该城市前九周(不考虑死亡人数的前提下)至少需要准备多少病人床位?(保留二位小数)(注:出院人数不少于新增发病人数时,总床位不再增加)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8705064bb1ac4934b21bb5a01eff6c7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f4f2e734f012cde5a4c089d00e9ddc5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42ec6427e5abd9ad70fc3aa8533fd5a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cbeede118c407a800b05757b9a1393e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c9b6e51986fe5d7a7265e0e93adcb4d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/106cd91d11760833dd96a706f5041b7a.png)
(Ⅰ)求该城市第5,6,7周新增发病人数;
(Ⅱ)随着该城市不断加大科研投入,治愈人数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54e8b191a7f982cc6a4230ae57bf6ce2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eceb8556afae0397cb7b94e5b297f636.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐2】计算:
(1)
;
(2)
.
(3)
;
(4)
.
(5)
;
(6)
.
(7)
;
(8)若
,求
的值.
(9)
;
(10)
.
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bb34f7449f60c94a9890a2a6b36b934.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68ec85d1485392bb05ee040b2555aff1.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4d82ae57af685dd51f06ccf19baafde.png)
(4)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9c0a58266a9b2183716a19453050947.png)
(5)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb9a5eb548303a89ae328597dd545d38.png)
(6)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f69fc47e1ecdd9cacb33d6f46974fda.png)
(7)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b575a55f0cd5710828a99c35cb425dff.png)
(8)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7730288fdd66fbc6ed4a7b75ac72b58.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/757eb3f55cff1e6fef064db4efae9e28.png)
(9)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/925305ac39bc9de6ba50d45885e33164.png)
(10)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d50c3fd84d4e15054f72d148fe9fe32.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
名校
【推荐1】求下列各式的值
(1)计算:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba2ec07f67567fee350e7dfbe0195135.png)
(2)当
时,求
的值.
(1)计算:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba2ec07f67567fee350e7dfbe0195135.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83d08a92e6ed65682f54180581ed304a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11afbd452f2fcd40ae32c26055a68ec1.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
名校
【推荐1】若
,且满足
.
(1)求
的最小值及相应x,y的值;
(2)求
的最小值及相应x,y的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2a9344f4fca7b9779ca7720e5277ea6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9482173f803db46ce48a5ae729498d7b.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f29d5f376c75c41ae6af0c8a8565449.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b88584cf1df43e28d03592c7998b1653.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
名校
解题方法
【推荐2】已知不等式
的解集为
.
(1)求实数
,
的值;
(2)若
,
,且
,求
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92b025c791a9309ac449ffa253e9a93c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d1e6289d3217ff6592826ecb5f98873.png)
(1)求实数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58b140e221ddf537b8964fff8557cca0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de8610232c77741a37463feba1a66c94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb197b1be4db1a7c719356ad5787b9b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec8a65013ad017ccbb0c3ab264e75b58.png)
您最近一年使用:0次