名校
1 . 下面给出了四个类比推理:
①
为实数,若
则
;类比推出:
为复数,若
则
.
② 若数列
是等差数列,
,则数列
也是等差数列;类比推出:若数列
是各项都为正数的等比数列,
,则数列
也是等比数列.
③ 若
则
; 类比推出:若
为三个向量,则
.
④ 若圆的半径为
,则圆的面积为
;类比推出:若椭圆的长半轴长为
,短半轴长为
,则椭圆的面积为
.上述四个推理中,结论正确的是
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5ab9b3610c3d5e741235fc6c838517c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09e51c208d5e572c4ba46d1bca73a012.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df86174ae575ed1e17d15c3f4dc89c10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6642d2fa476b354e0f654666e939d00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83f992a6156a419f99520f26a1fac2e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/634189f68a1c0acdc568abf07866d5a9.png)
② 若数列
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe229b24e2d56ff6b491725ceae4ff2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9832bfda65341410bb3b40037a43dac9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bee4464b3b4eb6e52ee02f095aae84f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1cca3ebd10a38201939a3694cc95186a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6384fda7992e0751096f7b45d6e5a27b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/900a10d0685d864ec91c344741f78def.png)
③ 若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0260c51703ee6a152afe9d4dc9489692.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aab77bc798c1220ba2bf4a9ee45dfb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2daaa99c97229b49f0517d12b508a659.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ef830ae3060741dc59e3e0670e78c3c.png)
④ 若圆的半径为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c08aca740e2092da99d9ddb14f05b7fc.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/f37efe04a6e07c29563644958e7b799f.png)
A.① ② | B.② ③ | C.① ④ | D.② ④ |
您最近一年使用:0次
2017-11-01更新
|
727次组卷
|
2卷引用:陕西省西北工业大学附属中学2019-2020学年高二下学期期中文科数学试题
2 . 在等差数列
中,若
,公差
,则有
,类比上述性质,在等比数列
中,若
,公比
,则
的一个不等关系是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4be2164a2c67d6163faee87a10942bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82d679eab940e750bfe1d8fc3d2ab80a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd042fda32e0ec28db998a40e691a68e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7adcc7ad144e9dd7fa4e5926ed231a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43b7e7cd571c8cd141cbbfe5d0890bf6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b574de7524e380d2c0dded9c9ba0d579.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a64dba0a09eaa81d5ad95211025926b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2bdfec4aa1f07f11c6b0e3a6c31151bd.png)
A.![]() | B.![]() |
C.![]() | D.![]() |
您最近一年使用:0次
2016-12-04更新
|
227次组卷
|
2卷引用:陕西省咸阳百灵学校2020-2021学年高二下学期第一次月考理科数学试题
2014高三·全国·专题练习
名校
3 . 下列推理是类比推理的是
A.![]() ![]() ![]() ![]() ![]() |
B.由![]() ![]() ![]() ![]() ![]() ![]() ![]() |
C.由圆![]() ![]() ![]() ![]() |
D.以上均不正确 |
您最近一年使用:0次
2016-12-03更新
|
1834次组卷
|
8卷引用:2015-2016学年陕西省汉台中学高二下期中理科数学试卷