What is the product of two prime numbers
The product of two prime numbers is a sum number, because there are four factors: two prime numbers, itself and 1
RELATED INFORMATIONS
- 1. In diamond ABCD, the point P and Q are on the edge AB and BC respectively, and AP = BQ. Try to judge the shape of △ PDQ and prove it
- 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. It is known that P1 (2,3), P2 (- 1,4), P is on the extension line of the straight line p1p2, and the vector | p1p | = 2 | PP2 |
- 4. If it is known that the length of the side edge of the regular triangular prism abc-a1b2c3 is equal to the length of the side edge of the bottom, what is the sine value of the angle between Ab1 and acc1a1
- 5. In rectangular trapezoid ABCD, ad is parallel to BC, AB is vertical to BC, and the angle DCB is 75 degrees. The other vertex e of equilateral triangle with CD as one side is on the waist ab Find AB = BC If f is a point on the line CD, the angle FBC = 30 ° and DF = FC are proved
- 6. If the two sides of a triangle are 5 cm and 8 cm in length, how many cm is the third side?
- 7. If the vector OA, ob, OC, OD satisfies: OA = xob + yoc + Zod (x, y, Z belong to R) and X + y + Z = 1, then a, B, C, D are coplanar
- 8. When the line X-my + 3 = 0 and the circle x ^ 2 + y ^ 2-6x + 5 = 0 intersect, tangent and depart from the circle respectively, the range of M is calculated The process
- 9. Calculate 1 / X (x + 1) + 1 / (x + 2) (x + 1). + 1 / (x + 2008) (x + 2009) and find the value of the algebraic expression when x = 1
- 10. Solve this inequality: 1 / 2x-1 ≥ 7-3 / 2x How to solve this inequality? Please write out the process
- 11. Given that a and B are two of the equations x2 + (m-2) x + 1 = 0 about X, then the value of (1 + Ma + A2) (1 + MB + B2) is______ .
- 12. If x > 1, Y > 1 and lgx + lgY = 4, then the maximum value of lgx · lgY is?
- 13. How many meters is a micron?
- 14. How many micrometers is one meter? How many nanometers is one meter?
- 15. What are the other units of measurement between micron (μ m) and nanometer (nm), nanometer and Pico meter (PM), Pico meter and flying meter (FM), and what is the rate of advance? Pay attention to the symbols
- 16. How to construct a fifth order magic square with 25 numbers 8-32
- 17. Put a magic square of order 5 with 25 numbers of 3 ~ 27 fast
- 18. Use 25 numbers 3 ~ 27 to arrange a magic square of order 5
- 19. Use 12.15.17.19.21.23.25.27.29 to compile a third-order magic square? Ask to do it in a square,
- 20. 3 5 7 9 11 13 15 17 19 how can they be arranged so that they are equal horizontally and vertically