[Novice] Math synchronous exercises in the first day of junior high school.

I. Fill in the blanks:

(1) If x

(2) If |a+2|+(b+ 1)2=0, then (1/a)+b = _ _ _ _ _ _

(3) The divisor of 4080300 with three significant digits is _ _ _ _ _ _ _

(5) algebraic expressions a2, a2+ 1, (a+ 1)2, a2+|a|, _ _ _

(6)(-32) radix is _ _ _ _, power is _ _ _ _, and the result is _ _ _

(9) A three-digit number, where the ten digits are A, one digit is three times smaller than the ten digits, and the hundred digits are half of the ten digits. Algebraically, this three-digit number is _ _ _ _ _

(10) If the value of the polynomial (2mx2-x2+3x+1)-(5x2-4y2+3x) has nothing to do with x, the value of 2m3-[3m2+(4m-5)+m] is _ _.

Second, multiple-choice questions:

(1) known x

a、2 B、-2 C、+2 D、0

a、x & gt0，y & gt0 B、x & lt0y0，y & lt0 D、x0

(3) If the square root of a rational number is equal to -x, then x is ()

A, negative b, positive c, non-negative d, non-positive.

(4) If the numbers represented by the numbers m and n on the number axis are as shown in the figure, then m, n, -M and -N are arranged in the order from small to large, which is ().

a、n & ltm & lt-n & lt； -m B、m & ltn & lt-m & lt； -n C、n & lt-m & lt； m & lt-n D、n & lt-n & lt； m & lt-m

(5) If |a-3|=3-a, the value range of A is ()

a、a≥3 B、a≤3 C、a>3 D、a