1, 3, 5, 7, 9. What's the nth number

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• 1. 1. - 3.5. - 7.9 according to this rule, how to express the nth number
• 2. The nth number is 2 4 6 8 10 what is the nth number? What is the nth number 14 9 16 25 what is the nth number? 12 / 14 / 18 / 16 what is the nth number What is the nth number of 0 3 8 15 24? What is the nth number of 1 3 6 10 15 What is the number n of 24 8 16 32
• 3. 1 / 3, 1 / 7, 1 / 9... The nth number is
• 4. Please write the following changes in the text expression 1. A dark red powder burns in oxygen and produces a lot of white smoke 2. A light yellow powder burns in the air and gives off a weak light blue flame 3. A silvery white metal burns in oxygen 4. A kind of black powder burns violently in oxygen and emits white light. The colorless gas generated can make clear lime water turbid
• 5. All the expressions of words and letters before the ion in the ninth grade
• 6. Chemical oxygen production should be complete and good
• 7. In VB, such an expression M 5
• 8. The value of expression "25 / 2 ^ 3" in VB? Why?
• 9. How to write the expression in VB sq1 = Trim(Text4.Text) IF.THEN How to write an expression like "SS%" here
• 10. Ask the great Xia about the meaning of an expression in VB pi=4# * Atn(1#) edal=edal/100#
• 11. 1, - 3,5, - 7... According to this rule, what is the nth number?
• 12. 1,5,9,13,17. Express the nth number with algebraic formula
• 13. A string number: 5, 10, 17, 26 The nth number is represented by an algebraic expression containing n
• 14. As in 2 / 3 - 3 / 4 4 / 5 - 5 / 6 6 / 7 - 7 / 8, the nth number
• 15. -1 / 2,2 / 3, - 3 / 4,4 / 5, - 5 / 6,7 / 8... Conjecture the sum of the nth number and the nth plus one number (n is odd)
• 16. 1,-2,3,-4,5,-6,7,-8…… What is the number 2004 and the number 2005?
• 17. 1, - 2,3, - 4,5, - 6,7, - 8______
• 18. There are 1 cube in the first layer, 3 cubes in the second layer, and 6 cubes in the third layer How many cubes are there in layer N? Expressed by the formula with n
• 19. The first layer has one cube, the second layer adds two cubes on the basis of the previous layer, and the third layer adds three cubes on the basis of the second layer. How many cubes are there in the N layer There is one cube in the first layer, two cubes in the second layer and three cubes in the third layer. How many cubes are there in the N layer
• 20. A number of square pendulum figures with equal edge length, in the order: from top to bottom, 1 in the first layer, 3 in the second layer, 6 in the third layer, and 4 in the fourth layer A number of square pendulum figures with equal edge length, in the order of top to bottom One in the first layer, three in the second layer, six in the third layer, ten in the fourth layer, and fifteen in the fifth layer. What is the number of cubes in the nth layer? We stipulate that "△" is a new operational symbol. We know that 5 △ 3 = 5 + 6 + 7; 6 △ 2 = 6 + 7, 2 △ 4 = 2 + 3 + 4 + 5, then 3 △ 5= What's after the equal sign? Write out the process and I will score!