If |a|=|b|, then a and B _ _ _ _ _ _ _ _
Simplification: | 3-π| = _ _ _ _ _. 3. The absolute value of a number is its reciprocal, and this number is _ _ _ _ _ _ _. 4. The point 5, which is the distance from the number -3 on the number axis, represents the number of _ _ _ _ _ _ _. 5. Calculation:-2-32 = _ _ _ _ _. The reciprocal of 7.-5 is, the reciprocal of 0. 125 is, and the reciprocal of is. 8. Given | x-3 |+(y+2) 2 = 0, then x+y _ _ _ _ _ _ _. Second, multiple-choice questions (3 points for each question, * * 18 points) 1. The following statement is correct: [] A. A number is either positive or negative B. The number with the smallest absolute value is 0 C. The number whose cube equals itself is1d. The number whose reciprocal equals itself is 1 2. Known |. Then the value of a is [] a.3b.- 1 c.3 or-1d. Uncertainty 3. In the following formulas, the results are equal to [] A.23 and 32 B.-23 and |-2 | 3 C.-32 and (-3) 2d. Given A < 0 and AB < 0, simplify | a-b-3 |-4+b-a | to get [] a.-1b.1c.7d.-7 5. The following statement is wrong: [] A. A number plus a positive number, a number minus a negative number will definitely become larger.
In rational numbers -3, 0, 20,-1.25, 1,-,-(-5), positive integer is, negative integer is, positive fraction is, and non-negative number is.
Given | a |a|=4, then a =
Comparison size: (1)-2+6; (2) 0 - 1.8 ; (3) _____
The smallest positive integer is _ _ _ _ _; The rational number with the smallest absolute value is _ _ _ _ _. The number whose absolute value is equal to 3 is _ _ _ _ _.
The number whose absolute value is equal to itself is.
Write the answer directly: (1) (-2.8)+(+ 1.9) =, (2) =,
A little messy! ! Is that enough?
Third, the calculation problem.
17.
18.8-2×32-(-2×3)2
19.
20.[-38-(- 1)7+(-3)8]×[-53]
2 1.– 12 × (-3)2-(-)2003×(-2)2002÷
22.– 16-(0.5-)÷×[-2-(-3)3]-∣-0.52∣
Fourth, answer questions.
23. Given1+2+3+…+31+32+33 =17× 33, find1-3+2-6+3-9+4-/kloc-.
24. Add "+"or "-"before the number 1, 2, 3, …, 50 and sum. What is the smallest non-negative number of the result? Please list the solution of the formula.
25. A maintenance team set out from place A to repair the lines on the east-west road. If it is stipulated that eastbound driving is positive and westbound driving is negative, then the driving record of seven times a day is as follows. (Unit: km)
first time
second time
the third time
the fourth time
the fifth time
Sixth times
seventh
-4
+7
-9
+8
+6
-5
-2
(1) How far is it from A when we call it a day?
(2) farthest from location a when recording for the first time.
(3) If the fuel consumption per kilometer is 0.3 liters, how many liters will * * * consume?
26. If rational numbers A and B satisfy ∣ ab-2 ∣+( 1-b) 2 = 0, try to find the value of+…+.
Reference answer:
I. Multiple choice questions: 1-8: bcaddbcb
Second, fill in the blanks:
9.-3; 10. Non-positive number; 1 1.； 12.2:00; 13.3.625× 106; 14.-9; 15.5 or-5; 16.6
Third, the calculation problem 17. -9; 18.-45; 19.； 20.； 2 1.； 22.
IV. Answering questions: 23. -2× 17× 33; 24.0; 25.( 1) 1 (2) 5 (3) 12.3; 26.