Arithmetic sequence - 10, - 6, - 2,2 How many of the top items of the sum of 54?

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• 1. The sum of the first several terms of the arithmetic sequence - 10, - 6, - 2,2. Is 54
• 2. The sum of the first several terms of the arithmetic sequence - 10, - 6, - 2,2 is 54? How does the process of finding the middle come from
• 3. Given 333111112: □ = 37:54 + 55 + 56 + 57 + 584 + 5 + 6 + 7 + 8, what is the number represented by the box?
• 4. 56 × 295 + 56 × 6-56 =? Urgent, simple operation!
• 5. 46 * 5.6-4.5 * 56 simple operation
• 6. How to do the simple operation of 1311 × 79.45 + 159 × 47.56 + 1591 × 52.44?
• 7. Simple calculation 23.8×4+17.2×4 16.75-0.42-4.58 10.1×8.3 0.125×8.8 0.25×17×40
• 8. What about 3, 4, 8, 17, (), 58
• 9. - 64) + 17 + (- 26) + 58
• 10. 14 22 () 44 58
• 11. According to the formula, first find the number of terms, and then find the sum of arithmetic sequence. (1) 7 + 10 + 13 + 16. + 100 (2) 16 + 21 + 26 +. + 206 Everybody, you're smart! Be sure! There won't be any chance on Friday! Use the tail of the item!
• 12. The arithmetic sequence is in the arithmetic sequence 213206199192,. 94,87, in which the 10th item is the number
• 13. In the sequence {an}, A1 = 2, a (n + 1) = an (n + 1) / N, find the general formula of {an}
• 14. High one mathematics ~ arithmetic series solution, thank you! In the arithmetic sequence {an}, S10 = 120, then the value of A2 + A9 is? Brother on the first floor, can you be more detailed? I really don't understand!
• 15. Arithmetic sequence in senior one Given sequence {an} and {BN} satisfy bn=(a1+2*a2+3*a3+...+na4)/(1+2+3+...+n), If {an} is an arithmetic sequence, {BN} must be an arithmetic sequence, and vice versa Help, do right can add points
• 16. On exponential function (25 14:30:58) It is reported that the water quantity of Qinghai Lake has decreased by 10% in the last 50 years. According to this law, let the water quantity of the lake in 2002 be m, and find the functional relationship between the water quantity y and X after X years from 2002
• 17. Arithmetic sequence 2 (259:21:24) s100=10    s10=100 Then S110 = how much?  
• 18. 86 degrees 23 minutes 12 seconds - 67 degrees 36 minutes 50 seconds = 49 degrees 28 minutes 52 seconds / 4=
• 19. 74 degrees, 23 seconds, 36 minutes, 6!
• 20. At 8:58 Beijing time on December 26, 2004, an earthquake with a magnitude of 8.7 occurred in Indonesia and triggered a powerful tsunami. The epicenter of the earthquake was located in Indonesia______ Plate and_______ At the junction of plates, the type of plate boundary is______ Border. Singapore is close to the epicenter, but not affected by the tsunami, because_____________ When it's still small, it spreads______ And arriving________ It can be predicted. The disaster is very serious, and the local early warning mechanism is not perfect___________ It has something to do with it