The middle school mathematics midterm exam question name: class: 1. Multiple choice questions (3 points for each question, ***30 points) 1. If it is stipulated that going east is positive, then -8m is () a, 8m b to the east, 8m c to the south, 8m d to the west and 8m 2 to the north. The algebraic formula (a-b)2/c means () the square of the difference between A and B is divided by c B, the square of A and B is divided by C C C, the square of the difference between A and B is divided by CSD, and the square of A and B is divided by. Odd number c, negative number d, even number 4, adding a "-"sign before a number can get a () A, negative number b, arbitrary number c, reciprocal d of the original number, and non-positive number 5. If ab=0, then there must be () A, A = B = 0ba = 0ca, and at least one of B is 0. At least one of b is 06, which is negative in the following numbers: () a,-(-1/2) b-|-1/3 | c-[+(-1/5)] d |-1/. (2) A number subtracts its inverse, and their difference is twice that of the original number; (3) Zero minus a number must be negative. (4) The positive number of burden reduction must be negative. (5) rational number addition and subtraction, the result must still be rational number. A, 2 B's, 3 C's, 4 D's and 5 8' s, and the following numbers are () A, -(-0.2) =+(+ 1/5) B, (-3)+(+3)=6C, +(- 1) = If the quotient of the absolute value of a divided by a is-1, then a must be () a,-1 B, 1 or-. (3 points for each question, ***30 points) 1 1. There are students A, B and C in the classroom, and then there are students () in the classroom. 12. It is known that the product of two numbers is 36. If one of the numbers is m, the sum of these two numbers is () 13. When x= (), the value of algebraic formula (x-4)/3 is equal to 0. 14, the temperature from a. C is () 15, let a be x and b be y, then "the product of a and b minus the difference between a and b" can be expressed as () 16, and if A >: 0, then | = ()/kl. (4 points for each question, * * * 16 points) (19) {0.85-[12+4 (3-10)])/5 (20) [(-3) 3- (6 points for each question, ***24 points) 23. Given that | a |=5, |b| =3, a and b are different symbols, find the value of algebraic formula (a+b)(a-b). 24. On the number axis, all integers whose absolute values are not greater than 5 are represented. 25. The weights of five bags of wheat are 183kg, 176kg, 185kg, 178kg, 18 1kg respectively. The excess kilograms are positive, and the shortage kilograms are negative. So how many kilograms do these five bags of wheat exceed or fall short of the standard weight? What is the total weight of these five bags of wheat? 26. During the holidays, the school organizes students to participate in work-study programs for a period of time, and each student receives financial support from 15 yuan. During the activity, some students bought a meal, and the meal fee was deducted 15 yuan. The meals and money actually received by students are as follows: (65,438+0) Write the formula (2) of C with n (n is a natural number less than or equal to 25). The number of meals n times is as follows (RMB1.6015-0.60 =14.421.201.20 =13. (20 points) 1, a.b is the reciprocal, c and d are the reciprocal, |m|=3. Find the value of m+cd-(a+b)/(a+b+c).