Examination time: 90 minutes, the total score of the test paper 130 points.
Name _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
Nationality _ _ _ _ _ _ _ _ School _ _ _ _ _ _ _
First, multiple-choice questions (5 points for each question, ***50 points)
1. Algebraic value ()
A. it's 0 B. It is between 0 and 1. C. between-1 and 0. D. equal to 1 or-1.
2. In order to make the score meaningful, the value range of is ()
A.x≠0 B. x≠0 and x≠ 1 C. x≠0 or x≠ 1 d.x ≠ 0 ≠ 0 and x ≠/kloc-0.
3. If the center of gravity of a triangle is on one of its high lines, then the triangle must be ().
A. isosceles triangle B. right triangle C. equilateral triangle D. isosceles right triangle
4. Let w = 7321× 7322× 7323× 7324+1,then w is ().
A. a square number B. a cubic number C. a prime number D. an even number
5. let x