2019高一数学寒假作业答案

精心整理

2019高一数学寒假作业答案

题号 1 2 3 4 5 6 7 8 9 10 11 12

答案 D D D A D D B C A C B C

13. ; 14. 4 ; 15. 0.4; 16. ②③

17.(1)∵A 中有两个元素，∴关于的方程有两个不等的实数根，

∴ (2)当当 A 没 18 (1) (2) 此时 19.解: 即 ⑵由把看作是关于的二次函数,则有

解得即为所求. …………12分

20.解： (1)常数m=1…………………4分

(2)当k 当k=0或k 1时, 直线y=k 与函数的图象有唯一的交点，

所以方程有一解;

当0

精心整理

所以方程有两解.…………………12分

21.解：(1)设，有， 2

取，则有

是奇函数 4

(2)设，则，由条件得

在R上是减函数，在[-3，3]上也是减函数。 6

当

由，

当

(3)由

由(2)

22.

(3)

解得

取

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