(For reference only)

First, multiple-choice questions, 7 points for each question

1.C 2。 D 3。 B 4。 C 5。 D

2. Fill in the blanks, with 7 points for each question.

6. X>7 7.28/58.-2/39.810.2 3 times the root number 2.

Third, big questions, each with 20 points.

1 1.y=2/27x -8/3

12.( 1) Thinking: According to the equality of base angles, it is proved that BC=IC=CD, and C is the outer center of triangular BID.

(2) Idea: Connect OC, point H intersects with point BD, point I intersects with the vertical lines of AD, AB and BD, and the vertical feet are E, F and G respectively.

According to the nature of the outer center, BD=BF+DE and AF=AE are known, so it is enough to prove AE= 1/2BD=BH.

Prove that triangle BCH and triangle AIE are congruent

13.2025

14.***6: 1, 2, 4, 503, 1006, 20 12.