Fill in the blanks
1、 ; 2、 ; 3、 ; 4, or; 5、 ; 6、 ; 7、 ;
8、 ; 9、 ; 10、 ; 1 1、 ; 12、 ; 13、 ; 14、 。
Second, multiple choice questions
15、 ; 16、 ; 17、 ; 18、 。
Third, answer questions.
19, solution: ................. (4 points)
Set, and then, ............. (12 points)
∵, ∴ ..............( 12)
20. Solution: (1) If it is timely or arbitrary, then
∵ , ,
∴ This function is an incremental function.
When, similarly, the function is theoretically a subtraction function.
⑵
When, then;
When, and then.
2 1, solution: let the height of a regular quadrangular prism be.
(1) even number, the bottom angle is, ∴ and the bottom angle is, namely
∵, midpoint, ∴, once again,
∴ is the plane angle of dihedral angle, i.e.
∴ , 。
(2) Establish a rectangular coordinate system as shown in the figure, including
Let the normal vector of the plane be,
Get
So, the distance from the point to the plane is.
22、⑴ ;
② Any, set, and then, that is.
② Hypothesis (contradiction), Ⅷ
The items in the series, not the items in the series, are exactly.
⑶ ,
, ,
∵
When, in turn, ...
∴ 。
23. Solution: (1) Let it be a point on a line segment, then
, when,.
⑵ Set the endpoints of the line segments as respectively, and establish a rectangular coordinate system with a straight line as the axis and the midpoint as the origin.
Then, the point set is surrounded by the following curves
,
Its area is.
(3) (1) selection,
2 choice.
3 choice.