Reference answers to mathematics (literature and history) questions

First, multiple-choice questions: This question examines basic knowledge and basic operations. The first question is 5 points, out of 50 points.

1.c analysis: This topic examines the coordinate operation and quantity product of plane vectors.

, 。

2.b analysis: this question examines the binomial theorem. So the constant term is.

3.a analysis: This question examines the set operation and the necessary and sufficient conditions.

4.d analysis: This question examines the volume formula and spatial imagination of the ball. The radius of the ball is, so according to the volume formula of the ball,

5.c analysis: this question examines the graphical representation of binary inequalities.

6.a analysis: This question examines the basic properties of functions: periodicity and parity. As can be seen from the meaning of the question, the function is a odd function with a period of 4.

So,

7.a analysis: this question examines the translation of the image and the symmetry and maximum value in the trigonometric function. According to the meaning of the question, the analytical formula of the image is that when it is symmetrical, according to the options, A is correct.

8.d analysis: This question examines the function definition domain. To make a function meaningful,

Yes,

9.b analysis: this question examines the basic knowledge of permutation and combination. Indirect: If no girl is selected, the required result is, so B is correct.

10.b analysis: this question examines the relationship between the basic quantities of an ellipse.