(3.91 + 3 / 7 + 6.09 + 6 / 7) * (2 / 8-1.125) Simple calculation

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• 1. X divided by a quarter = half
• 2. An old man said, "add 17 to my age and multiply it by 1 / 4, then subtract 15 and divide it by 1 / 10. It's exactly 100 years old." how old is this old man this year? (note! We must use formula, not equation ~)
• 3. (3 and 3 / 11 × 25.8-3 and 3 / 11 × 16.76 + 18 / 35 × 19.6) × (1.25-7 / 12 + 5 / 36) × 1 / 29 It's not easy, but please hurry up
• 4. a. The difference between B and a is 737. A is divided by B to get 16, and the rest is 17. A =? B =?
• 5. 4:3-9:7 (8:1-2:4)
• 6. The quotient of a number divided by 7 is greater than 7. Find the number Solve by equation
• 7. How many meters and decimeters is 9.6 meters?
• 8. -1 / 36 / [- 1 / 9 + 1 / 12 - 1 / 18 + 1 / 36] What's the equivalent?
• 9. Choose a number from 1 to 9, multiply by 3, add 3, multiply by 3, and then add up ten digits. Why is it always equal to 9? I can't figure it out!
• 10. 3:7 = 3 of 7 = 9 divided by several = 35 parts
• 11. Spend time or money doing something
• 12. If the results of the following two questions are non-zero natural numbers, find the minimum value of R and S (1) r divided by 5 times 1 / 3 (2) 6 / 7 times s divided by 0.6 Want formula + answer
• 13. 5 out of 18 plus 2 out of 27 plus 10 out of 27?
• 14. It is known that the equation of tangent of curve C, y = x ^ 3 + AX-8 at x = 2 is y = 15x + B (1) Finding the value of real numbers a and B (2) If the tangent l of curve C passes through point P (4 / 3, - 4), the equation of line L is obtained
• 15. Given the curve C: y = x ^ 3 + 2 and point P (1,3), then the tangent equation passing through point P and tangent to curve C is
• 16. Given the function f (x) = x ^ 3-x, find the tangent equation of the curve y = FX at x = t
• 17. Given the curve y = 1 / 3x3 + 4 / 3 (1), find the tangent equation of the curve at point P (2,4) (2) find the tangent equation of the curve passing through point P (2,4)
• 18. If the axis of symmetry of the parabola y = AX2 + BX + C (a ≠ 0) is a straight line x = 2 and the minimum value is - 2, then the root of the equation AX2 + BX + C = - 2 about X is______ ．
• 19. It is known that the parabola y = AX2 + BX + C passes through the point (- 1,2) and the roots of the equation AX2 + BX + C are - 3,1 respectively Solving the parabola analytic formula Finding the coordinates of parabola vertex
• 20. If the image of parabola y = AX2 + BX + C is shown in the figure, then the root of the equation AX2 + BX + C-2 = 0 of X is (Note: the opening of the image is downward, the ordinate of the intersection with the Y axis is less than 2, and the symmetry axis is on the right side of the Y axis) A. There are two unequal real roots B. Real roots with two different signs C. There are two equal real roots D. There is no real root There are two intersections with the X axis