When x is a value, the following expressions are meaningful in the range of real numbers? 1.√-5x 2.√|x|+1 3. Cube of √ x 4.√3x 5.√6+2x²

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• 1. When x is a value, the following expressions are meaningful in the range of real numbers?         √x 2.        √-x 3.             √x+2 4.      √1-2x 5         √3x+1 6 & nbsp; & nbsp; & nbsp; & nbsp; √ x 1 / 2 7 & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; √ X-1 / 2 8      √x+1/x
• 2. When x is a real number, the following expressions are meaningful in the range of real numbers (1) Radical x + 5-radical 4-2x (2) 2-x radical x + 2 (3) The root of X + 2 is X-2
• 3. Given that a function is an even function defined on R, given that x ≥ 0, f (x) = x ^ 2-2x, find the monotone interval and range of the function
• 4. In a square piece of paper with a circumference of 100cm, cut the largest circle. What is the radius of the circle?
• 5. Kneel down to seek the answers to these calculation questions (1) [3 and 1 / 6 - (7.35-5 and 1 / 12) / / 1.02] / / 1 and 1 / 3 (2) [2 and 1 / 3 + (5.4-2 / 3) × 1 / 3] / / 3 and 4 / 9 (3) 1 / 5 × [(12.25 △ 4 and 1 / 6) × 77%] - 1 and 2 / 3 (4) 6.3 × [(1.4 + 1 / 3) × 1.12-1 / 6] (5) 4.3 × [(3.7-1.5) × 1.25-3] + 1 / 3 (6) 3.6 × [(1.6-2 / 3) × 1.9-7 + 3 / 8] (7) 7 / 5 × [14.8 + (3.7-1.5) × 1.25-3]
• 6. A square, cut 6cm on one side, cut 2cm on the other side, the remaining rectangle is 68cm2 less than the original square area?
• 7. Density calculation problem
• 8. In a rectangle of 12cm long and 5cm wide, draw the largest semicircle. The circumference of the semicircle is () cm and the area is () cm
• 9. Simplify SiNx + cosx + sinxcosx to get the maximum value
• 10. Among the 100 natural numbers 1-100, how many can be divisible by 3?
• 11. When x is what value, the following expressions are meaningful in the range of real numbers? 1.√3-X 2. √ 1 / 2x-1
• 12. When the value of √ x-3 + √ 4-x x is what, the following expressions are meaningful in the range of real numbers
• 13. What is the value of X Radical X & # 178; - 2x + 3
• 14. What is the value of X when the following expressions are meaningful in the range of real numbers? 3 / 2x + 5 under root, X-3 under the root plus 3-x under the root The square of - A under the root sign 2x-1 / 2x-3 under radical The first one is not very clear 3 / (2x + 5) under root
• 15. What is the value of X 1. Root 6x 2. Radical - 1 / X 3. Radical radical - 3x-2 4. Radical - 2 (x + 3) &;
• 16. When x is what kind of real number is the following, it makes sense in the range of real number ①√x²+1 Is the root X & # 178; + 1
• 17. Define the operation ⊙ x ⊙ y = (1-x) (1-y) on R if the inequality (x-a) ⊙ (x + a)
• 18. For rational numbers x and y, a new operation x * y = ax + by + C is defined, where a, B and C are constants. On the right side of the equation are the usual addition and multiplication operations. Given that 1 * 2 = 9, (- 3) * 3 = 6, 0 * 1 = 2, find the value of (- 2) * 5
• 19. For rational numbers x and y, define an operation "*": X * y = ax + by, where a and B are constants, and the right side of the equation is the usual addition and multiplication operation. Given 1 * 2 = 8, (- 2) * 3 = 5, find the value of 3 * 5
• 20. For real numbers x and y, define an operation "△": X △ y = ax + by, where a and B are constants, and the operation on the right side of the equation is the usual operation of addition and subtraction Given that 3 △ 5 = 25 and 4 △ 7 = 38, then 1 △ 5=