First, multiple-choice questions (this topic is entitled 10, with 5 points for each question and 50 points for * * *).

The title is 1 23455 6789 10.

Answer c, d, d, d, d, d, d, d, d, d.

2. Fill in the blanks (4 small questions in this big question, 5 points for each small question, 20 points for * * *)

1 1. 12. 13.500 14.

Iii. Answering questions (50 points for this big question)

15, (25 points for this question)

(1) When ∠ ABM > ∠ CBM, =

(2) When ∠ ABM = ∠ CBM, it does not meet the meaning of the question.

(3) When ∠ ABM < ∠ CBM, =

16, (25 points for this question)

Substitute equation (1) into equation (2) to get the equation about y.

Delta is obtained according to the meaning of the question, that is, then, that is.

, so-1 ≤ A ≤ 2, then the value of integer a is-1, 0, 1, 2.