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Mathematical answers to academic proficiency tests
20 1 1 Anhui junior high school graduation examination mathematics reference answer

1~ 10 ACACB DBDBC

1 1.; 12. 100; 13. 14.①③.

15. Original formula =.

16. let the quality of this rough mountain product be xkg, which means x+(3x+2000)= 10000 according to the meaning of the question.

The solution is x=2000.

Answer: The rough-machined mountain products has a mass of 2,000 kg.

17. The following figure

18.⑴A 1(0, 1) A3( 1,0) A 12(6,0)

⑵An(2n,0)

(3) upward

19. short answer: ∵OA,

OB=OC= 1500,

∴AB= (male).

A: The AB tunnel is about 635 meters long.

20. (1) Group A: median 7; Group B: average 7, median 7.

(2) (The answer is not unique)

① Because the average scores of students in Group B are higher than those in Group A, the scores of students in Group B are better than those in Group A;

② Because the average scores of students in group A and group B are not much different, and the variance of students in group B is lower than that of students in group A, it shows that the fluctuation of students' scores in group B is smaller than that in group A, so students in group B are better than those in group A;

③ Because the lowest score of students in Group B is higher than that of students in Group A, students in Group B are better than students in Group A. ..

2 1.( 1) From the meaning of the question, we can get the solution VIII.

And point A is on the function, so the solution is like this.

solve an equation

So the coordinate of point B is (1, 2).

(2) when 0 < x < 1 or x > 2, y1< y2;

When 1 < x < 2, y1> y2;

When x= 1 or x=2, y 1=y2.

22.( 1) is easy to find, so it is proved.

(2) If it is easy to prove ∽ and the similarity ratio is equal, it can be proved.

(3) 120 ,

23.( 1) If point A is AF⊥l3, point E and point F respectively, if point C is CH ⊥ l2, point H and point G respectively, it is enough to prove △ Abe △ CDG.

(2) It is easy to prove that △ Abbe △ BCH △ CDG △ DAF, two right-angled sides are h 1 and h 1+h2, and the quadrilateral EFGH is a square with a side length of h2.

So ...

3 by the meaning of the question, so.

0 < h 1

0 < h 1

When h 1=, s takes the minimum value; The first network of new curriculum standards

When < h 1

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