General formula - 1 / 3,3 / 5, - 5 / 9,7 / 17

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• 1. Known sequence √ 2, √ 7. √ 12, √ 17 Then its general term formula is --, 2 √ 13 is the --
• 2. 7+12+17+22+27+.+5n+2=
• 3. Find the sequence 121212121212 The general term formula of
• 4. Sequence 1 / 2, 1 / 6, 1 / 12, 1 / 20, 1 / 30, 1 / 42 The general formula of is Such as the title
• 5. 0,2,6,12,20,30,42 constitute a sequence to find the general term formula
• 6. What is the general term formula of sequence 1 212 216 11664?
• 7. A general term formula for sequence 13 + 2,13 + 6,13 + 12,13 + 20,13 + 30?
• 8. The general formula of 1-1. - 1-1?
• 9. How to find the general formula of 1, - 1,1, - 1 Isn't this a swing sequence? Why is the answer a long string of 1 / 2 + - 1 to the power of N + 1
• 10. What is the general formula of 1, - 1,1, - 1
• 11. The general formula of 2,7,12,17? Thank you for your help
• 12. Sequence 1 / 5, 2 / 8, 4 / 11, 8 / 14 A formula of
• 13. 0,2,5,9,14. The expression of the nth number It is easy to see from the sequence that the sequence is + 2; + 3; + 4; + 5 But how can I not find the general formula? want
• 14. Find the expression of sequence 1,4,8,13,19 I don't understand. Please explain clearly
• 15. What's the rule of 2,4,7,11,16? Please use n to express the general term formula
• 16. General term formula of sequence 2 4 8 14?
• 17. The general formula of 1,2,4,8
• 18. Physical properties of objects section 3 the conversion of some units in the density of matter, such as the conversion of units between ml and M3, please be more detailed, and the following questions! What is the mass of 1.100ml gasoline? What is the volume of 1.29Kg air? 2. A 2.5-liter bottle is filled with blended oil. The mass of the oil is 2kg, so what is the density of the oil? 3. It is necessary to select excellent grain seeds for agricultural scientific experiments. In an experiment of selecting wheat seeds, we need to measure the approximate grain number of 1kg wheat seeds and the approximate mass of a grain of wheat seeds. We only have a 200g pallet balance on hand. How can we complete the measurement quickly?
• 19. Can you tell me how to write these three math problems? 1. There is a rectangular chicken farm with an area of 150 square meters. One side of the chicken farm is against the wall, and a door with a width of 2 meters is set on the opposite side of the wall. The other three sides (except the door) are surrounded by bamboo fences, with a total length of 33 meters 2. A factory plans to reduce the cost to 64% in two years. If the annual reduction percentage is the same, calculate the percentage 3. If you sell a commodity with a purchase price of 100 yuan at 120 yuan, you can sell 500 pieces. It is known that every 1 yuan increase in the price of this commodity will reduce the sales volume by 10 pieces. If you want to get a profit of 12000 yuan, what should be the selling price? How many pieces should be purchased at this time? It is enough to set an unknown number
• 20. Help, the original question is like this: Sin (540-x) / Tan (900-x) multiplied by 1 / Tan (450-x) Tan (810-x) multiplied by cos (360-x) / sin (- x) If TaNx = 2 How can I simplify it? It's really evil,