It is proved that any three digit can be written twice to get a six digit, which can be divided by 7, 11 and 13 at the same time

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• 1. It is proved that any three digit can be divided by 7,11,13 at the same time
• 2. a. B and C are three different Arabic numerals. Try to determine the six digit abcabc so that it can be divided by eleven natural numbers from 1 to 11
• 3. Six digit 2008 () () can be divided by 15, so there are () such six digits
• 4. Write a three digit number and then write it again to form a six digit number in the form of abcabc. This six digit number can be divided by three continuous prime numbers____ Write a three digit number and then write it again to form a six digit number in the form of abcabc. This six digit number can be divided by three consecutive prime numbers__________________________________
• 5. English abbreviations BC, DJ, ztv, SOS, AC, CBA, PC, PM, DNA, PhD, VOA, USA, am, PRs, UK, GMT,
• 6. CBA,ZTV,PM,AM, CBA,ZTV,PM,
• 7. APEC.MTV.TM . IRC.IOC.ID . CAAC.PRC.ABC What is the Chinese meaning? The Chinese meaning of abbreviations
• 8. Who knows the abbreviations of IOC and PLA? Write down which is right and which is right
• 9. Abbreviations: what do WC, DJ, UK, UN, ABC, BBC mean? Just say the meaning!
• 10. What is the full English name of VOA
• 11. Please write three six digit numbers that can be divided by 7, 11 and 13 at the same time______ ．
• 12. Please write three six digit numbers that can be divided by 7, 11 and 13 at the same time______ ．
• 13. Please write three six digit numbers that can be divided by 7, 11 and 13 at the same time______ ．
• 14. In order to make the 6-digit 15 □ □ 6 divisible by 36 and get the largest quotient, it should be filled in______ ．
• 15. To make the 6-digit. 15abc6 divisible by 36 and get the smallest quotient, ask the original 6-digit ()
• 16. To design a program, input a three digit ABC from the keyboard, and then input the numbers from right to left in turn, that is, output another three digit CBA I'm a novice on Baidu, I don't have so many points. Please help me solve the problem even if I offer a low reward Sorry, I didn't make it clear. I'm looking forward to seeing your answers
• 17. As shown in the figure, D is a point on the side BC of △ ABC, and ∠ 1 = 2, ∠ 3 = 4, ∠ BAC = 63 ° to find the degree of ∠ DAC?
• 18. As shown in the figure, it is known that in △ ABC, D is a point on the edge of BC, ∠ 1 = ∠ B, ∠ 2 = ∠ C, ∠ BAC = 78 ° to find the degree of ∠ DAC
• 19. Through the vertex a of △ ABC, make AE ⊥ AB, ad ⊥ AC, make AE = AB, ad = AC, BD and CE intersect at point O. prove: (1) EC = BD (2) EC ⊥ BD
• 20. In the triangle ABC, point D is on the edge AC, DB = BC, point E is the midpoint of CD, point F is the midpoint of AB, passing through point a as Ag parallel EF, The extension line of intersection be is at point g. try to explain that the triangle Abe is equal to the triangle age