The general formula of 1,2,4,8

2^(n-1)

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1. General term formula of sequence 2 4 8 14?
2. What's the rule of 2,4,7,11,16? Please use n to express the general term formula
3. Find the expression of sequence 1,4,8,13,19 I don't understand. Please explain clearly
4. 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
5. Sequence 1 / 5, 2 / 8, 4 / 11, 8 / 14 A formula of
6. The general formula of 2,7,12,17? Thank you for your help
7. General formula - 1 / 3,3 / 5, - 5 / 9,7 / 17
8. Known sequence √ 2, √ 7. √ 12, √ 17 Then its general term formula is --, 2 √ 13 is the --
9. 7+12+17+22+27+.+5n+2=
10. Find the sequence 121212121212 The general term formula of
11. 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?
12. 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
13. 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,
14. The starting price of a taxi in a city is 16 yuan (i.e. 8 yuan for driving less than 3 km). After driving more than 3 km, an additional 3.1 yuan will be charged for driving 1 km, and the part less than 1 km will be counted as 1 km. One day, Xiao Li and her father pay 31.5 yuan for taking a taxi. How much is the distance?
15. It took 55 seconds for a train to cross a 1400 meter long bridge and 80 seconds for a train to cross a 2100 meter long tunnel. What's the speed and length of the train? Using equation
16. On the eve of Christmas, the kindergarten invited some parents to dress up as Santa Claus and distributed 221 toys and 88 school supplies to a child in the kindergarten. It was found that each child just got B toys, but after the average score of school supplies, there were still 3 toys left. So what's a? B how much?
17. Water can wear stone, is to tell us to do things have been constant imitation, write a sentence In the children's interest, we can see the omitted part of the supplement between the two insects and the grass What different sections can be obtained by cutting the Wuling column with a plane? What is the polygon with the most sides in the section of a cuboid?
18. Solve the equation of first degree with one variable! One group of mowers had to finish cutting two pieces of grass, one big and one small, and the big one was twice as big as the small one. They all cut on a large piece of grass for half a day, and then divided into two groups in the afternoon. Half of them continued to cut on a large piece of grass until the end of work in the afternoon. The other half went to cut on a small piece of grass, and there was still a small piece left when the end of work, which was cut by one person the next day, It just takes one day. How many people are there in this group? Set······ The rest is up to you!
19. Sixth grade first volume mathematics midterm paper PEP
20. A shopping mall used 360000 yuan to buy two kinds of goods a and B, and made a total profit of 60000 yuan after sales. The purchase price and selling price are as follows: ab purchase price (yuan / piece) 12001000, selling price (yuan / piece) 13801200 (1) how many pieces of goods a and B were purchased by the shopping mall; (2) the shopping mall bought two kinds of goods a and B at the original purchase price for the second time. The number of pieces of goods B was the same, while the number of pieces of goods a was the first If the two commodities are sold at a discount, and the profit from the second operation is no less than 81600 yuan, how much is the lowest price of B commodity?