Given that a and B are opposite numbers, C and D are reciprocal, the absolute value of X is 8, find CD + A + B - | X|

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• 1. It is known that a and B are opposite to each other, C and D are reciprocal to each other, and the absolute value of X is 5. Try to find the value of 2x - (a + B + CD) x1998 + (- CD) 1999 There is no multiplication sign in the formula, it's X!
• 2. -The product of the reciprocal of 2 / 7 and the number whose absolute value is 2 / 21 is () A. 1 / 3 B. - 1 / 3 C. 1 out of 3 d. 4 out of 147
• 3. If the absolute values of two numbers are equal, then two numbers are equal;
• 4. If the sum of the absolute values of two numbers is known to be 0, then the two numbers are zero
• 5. If two numbers 7 and - 15 are known, what is the absolute value of these two numbers? What is the sum of the absolute values of these two numbers?
• 6. What is the relationship between the absolute values of two opposite numbers?
• 7. Given that two numbers are 3 and - 5, the absolute value of the sum of these two numbers is______ The sum of the absolute values of these two numbers is______ The sum of the opposite numbers of these two numbers is______ The opposite of the sum of these two numbers is______ ．
• 8. If the absolute values of two numbers are 3 and 5 respectively, find the sum of the two numbers
• 9. How many numbers have an absolute value of 5?
• 10. [urgent] how many numbers are there whose absolute value is - 5? How many numbers have an absolute value of - 5? For Formula 2 - | x, when x is equal to what value, there is a maximum value? What is the maximum value? For the formula | x | + 13, when x is equal to what value, there is a maximum value? What is the maximum value? The third question is wrong: for the formula | x | + 13, when x is equal to what value, there is a minimum value? What is the minimum value?
• 11. -What is the result of the opposite number of the absolute value of 7 plus the opposite number of - 3 (☆_ ☆)（＾_ ＾）*\(^o^)/*
• 12. Any number whose absolute value is less than 1 can be expressed as () by scientific counting method, where n is a positive integer and a satisfies ()
• 13. Scientific notation denotes the following numbers -870000 by scientific notation: 3.96 million scientific notation: What is the index of the last 10 digits of a nine digit scientific notation_______ If there is a number recorded in scientific notation, the exponent of 10 is 19, then the number has______ Bit integer
• 14. Scientific notation shows the following numbers 6.4 million square kilometers = () square kilometers - 38700 000 = () 4.1 times 10 to the 5th power = () 2.5 times 10 to the 13th power = () -8300.12 = () - 1.707 times the 7th power of 10 = () 1701 / 4 = () - 9.75 times the 11th power of 10 = () 10 430 000=（ ） 110000=（ ） If there is a power of 8.64 times 10, and a year is 365 days, how many seconds does a year have? 10 years?
• 15. Absolute value and simple calculation Find the absolute values of the following numbers: (1) Three times root number - 8, (2) root number 17, (3) root number 2 / - 3, (4) root number 3-1.7, (5) 1.4-root number 2 Calculation: accurate to 0.01 (1) Radical 5-radical 3 + 0.145 (2) Cubic radical 6 - (PI) - radical 2 (3) Radical 10 + 2.23 - (PI) (4) (- 4) x root 7 + 2 and root 6 (the result retains three significant digits) If you answer 3 and 4 of the calculation questions correctly, there will be additional points
• 16. Mathematics on absolute worth calculation 1. Known: a = 8, B = - 8 / 3, find the value of | B | A-A | - B |. 2. Compare the size of M and 2m. 3. If | 2a-1 | + | 3b-2 | = 0, find the value of a + B. 4. Known | - A | = 1, | B | = 1 / 3, find the value of | a | + B
• 17. Let FX = the third power of X - 1 / 2x & # 178; - 2x + 5-m, when x ∈ [- 1,2], FX
• 18. In the polynomial 6a-2a3x3y-8 + 4x5, the coefficients and constants of the highest order terms are () A. 2 and 8b. 4 and - 8C. 6 and 8D. - 2 and - 8
• 19. The second power of polynomial 2x + the third power of 4x - 3 is the - degree - term formula, and the constant term is -
• 20. Given X / X & # 178; - x + 1 = 1 / 5, find the value of X & # 178 / X4 power + X & # 178; + 1