Fill in the blanks of mathematics in grade one of junior high school 1. Fill in the basis of deformation in brackets: (a + b) + C = a + (B + C) () = (B + C) + a() Mathematics choice in grade one of junior high school 1. If M is a rational number, then the result of M + | m | must be(). (A) Positive number (B) Negative number (C) Non positive number (D) Nonnegative number

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• 1. To add brackets to polynomial A-B + C-D, the following addition method is wrong A、(a-b)+(c-d) B、(a+c)-(b+d) C、(a-d)+(b-c) D、 a-(b-c+d)
• 2. First volume of junior high school mathematics to remove brackets and add brackets 1. Given that the square of M minus Mn = 20, the square of Mn minus n = minus 12, find the value of the algebraic formula m minus N and M minus 2Mn + n 2. The circumference of the triangle is 48, the length of the first side is 4A + 3b, the first side of the second side is less than 2a-b, find the length of the third side
• 3. (1) -(2m-3) (2) n-3(4-2m) (3) 16a-8(3b+4c) (4) t+2/3(12-9v) (5)-(5m+n)-7(a-3b) (6)-1/2(X+Y)+1/4(p+q) (7)-8(3a-2ab+4) (8)4(m+p)-7(n-2q) ----------------------------------------------------------- Please write down the process If you are good at these people, Please tell me how to do these questions If it's good It's all well written, But please make up the process
• 4. Come on. OK, there's more money!
• 5. How to read SGN in piecewise function y = sgnx? If you read it out, what's the pronunciation like? For example, what does SGN read?
• 6. How many square decimeters is 15 square centimeters equal to
• 7. The third power of a * B minus the third power of a * B
• 8. How much is 1 / 4 times 2 / 3?
• 9. Let f (x) = 1-1 / 2cos (2x) + asin (x / 2) * cos (x / 2) (a ∈ R) have the maximum value of 3
• 10. In a division formula, the quotient is 6 times the divisor, and the divisor is 6 times the remainder. When the sum of quotient, divisor and remainder is 430, what is the divisor? Using equation
• 11. (a-b) - (- C-D) =? This question is about removing brackets
• 12. As shown in the figure, AC: CD: DB = 2:3:4, if e is the midpoint of AC, f is dB The distance between the midpoint, e and F is 5.4cm
• 13. Simplify | C-A | + | C-B | + | a + B|
• 14. Given A-B = - 3, C + D = 2, then the value of (B + C) - (A-D) is () A. 1B. 5C. -5D. -1
• 15. (about plane rectangular coordinate system) On the problem of plane rectangular coordinate system The following statement is true: A point that doesn't belong to any quadrant is not on the axis, it's at the origin B the abscissa and ordinate are exchanged to represent another point The point with negative abscissa of C is in quadrant two or three The point whose D ordinate is less than 0 must be below the x-axis But I think B is wrong. It should be d,
• 16. Seven grade mathematics choice question! Urgent! Urgent! If the lengths of three sides of a triangle are a, B, x, and a Single choice
• 17. In the four corners formed by the intersection of two straight lines, the following statement is correct A. There must be an acute angle B. there must be an obtuse angle C. There must be a right angle d. There must be a non obtuse angle
• 18. 0123456789 consists of 4 digits It's the one with the phone code. If I can, I'll give it 100 points.
• 19. 0123456789 can be composed of several 6 digits
• 20. How many different 6-digit combinations can 0123456789 form