Eighth grade math test questions

The test time is 90 minutes, the test score 100, and the actual score.

I. Fill in the blanks (2 points for each question, 20 points for * * *)

1. if a>b and c < 0, then ac+ 1 bc+ 1 (fill in ">" or "

2. The solution set of inequality is _ _ _ _ _ _ _ _

3. Factorization:

4. When x _ _ _ _ _ _ _ _ _ _ the value of the score is zero.

5. As a result of simplification. (Figure 9) (Figure 10)

6. In an isosceles right triangle, the ratio of the right side to the hypotenuse is _ _ _ _ _ _ _.

7. If known, then.

8. Known line segment AB= 10cm, C is AB and has golden section (AC >；; BC), then AC = _ _ _ _ _ _ _

9. As shown in the figure, in Δ Δ ABC, if ∠AED=∠B, DE=6, AB= 10, AE=8, the length of BC is.

10. As shown in the figure, in a square ABCD, e is the midpoint of CD and p is the point above BC. One more condition is needed to make δδABP similar to δδECP.

Second, multiple-choice questions (3 points for each question, ***24 points)

1 1. Among the following polynomials, () can be factorized by the formula.

A, B, C, D,

12. As shown in the figure, the length of the rectangular newspaper ABCD is AB=acm, the width BC=bcm, and E and F are the midpoint of AB and CD respectively. After the newspaper is folded in half along the straight line EF, the aspect ratio of the rectangular AEFD is equal to the aspect ratio of the rectangular ABCD, so A: B is equal to ().

(A)∶ 1(B) 1∶0(C)∶ 1(D) 1∶ 1

13. If both A and B in the score are magnified twice, then the value of the score must be () (No.12).

A.it's twice as much as before. B.it's quadrupled. C. It's the original D. It hasn't changed

14. If the solution set of the inequality group is X >；; 2, then the range of m is ()

A.m≥2 B.m≤2 C.m=2 D.m