The sum of two prime numbers is 99. What are the two numbers?

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• 1. As shown in the figure, in the diamond ABCD, ∠ a = 60 °, points P and Q are on edges AB and BC respectively, and AP = BQ Given ad = 3, AP = 2, find the length of PQ
• 2. As shown in the figure, in the trapezoidal ABCD, ad ∥ BC, AC and BD intersect at O, and parallel lines passing through o intersect AB and CD at e and f respectively. (1) prove that OE = of; (2) if ad = 3, BC = 4, find the length of EF
• 3. Given vector PP1 = - (2 / 5) * vector p1p2, if vector p1p = λ PP2, then λ=
• 4. 1. If the length of three sides of a triangle ABC is continuous even, M is the midpoint of AB, MC = ma = 5, then the area of triangle ABC is 2. On the elevator, Xiao Kai's height is 1.8 meters. If Xiao Kai's head rises 6.2 meters with the elevator, the distance of Xiao Kai's feet is 3. Given that the point P (x, y) is in the second quadrant, and Y is less than or equal to x + 4, x, y are integers, write out the coordinates of a point P that meets the above conditions 4. For the function y = (K-3) x + K, when k = it is a positive proportional function, when k = it is a linear function 5. If the solution of {ax + by = 2 is the same as that of {2x + 3Y = 4, then a =, B = ax-by=2 4x-5y=-6
• 5. On April 18, 2004, the fifth speed increase of National Railways was made. Among them, 1084 trains from Urumqi to Chongqing had the largest speed increase. The whole journey was shortened by 9h. It is known that the journey from Urumqi to Chongqing is 3405km. The average speed before the speed increase is about 52km / h. the average speed after the speed increase is calculated. If the average speed after the speed increase is XKM / h, the equation can be formulated as follows:———————————— Reward for correct answer
• 6. 9. It is known that P is a point in the parallelogram ABCD, s parallelogram ABCD = 100, then s △ PAB + s △ PCD = () It is known that the diagonals of the parallelogram ABCD intersect at point 0 If the perimeter of △ BCO is 2cm longer than that of △ AOB, then AB = ()
• 7. 1. When x > 1 is simplification ------------------- Square of (x + 1 / x) - 4 2. The two adjacent sides of the parallelogram are 3 and 5. The length of the two line segments divided by an acute angle bisector is 3. It is known that the length of four sides of a trapezoid is 1, 2, 3 and 4 respectively, then the area of the trapezoid is
• 8. Second grade mathematics multiple choice question! Online wait for answer! Xiaohua prepared three wooden sticks to make a right triangle frame. Xiaoying accidentally cut off one of them by a third. Xiaohua can still make a right triangle as long as she takes the other two wooden sticks A. Cut off one-third B. cut off two-thirds C. both of the above can be done D. do not need to change Please explain the reason! Thank you! What's more, is the cut-off one third a proportion or a quantity??
• 9. 5 + the decimal part of root 7 is a, 11 minus the decimal part of root 7 is B, find the value of a plus B and a minus B
• 10. Looking for five geometry problems in mathematics volume 1 of grade 2 of junior high school There should be a graph and a solution. The teacher asked us to collect 5 questions. We should use the solution of grade two
• 11. If a and B are the two roots of the quadratic equation x ^ 2 + (M + 2) x + 1 = 0 with respect to x, then what is the value of (1 + Ma + A ^ 2) (1 + MB + B ^ 2)
• 12. If x > 0, Y > 0 and X + y = 5, then the maximum value of lgx + lgY is 0______ ．
• 13. Verification: A2 + B2 + 1 ≥ AB + A + B
• 14. [math problem 3 ^ 2-1 = 8 = 8 * 1; 5 ^ 2-3 ^ 2 = 16 = 8 * 2; 7 ^ 2-5 ^ 2 = 24 = 8 * 3; 9 ^ 2-7 ^ 2 = 32 = 8 * 4
• 15. 2 divided by (x-1) = 3 divided by (x + 1) equation
• 16. 4.78 divided by 0.2 + 3.44, there are 3.6-0.6 * 2 and 3.6-3.6 * 0.8
• 17. 4、 9 divided by [6 / 7 (1-2 / 5)] = 35 kg. What is the symbol after 6 / 7?
• 18. How many times 200 and 300 can be equal, and the sum of the times equals 900
• 19. 1 / 36 times 9 / 18 =?
• 20. If 8 * 8 = 54, what is 9 * 9