2. - 4, 8, - 16, 32, - 64, 128. What is the nth number? Why?

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• 1. 1、 - 2, 4, - 8, 16, - 32 2、 - 4, 8, - 16, 32, - 64 Write the nth number of each group and calculate the first eight of each group 1、 - 2, 4, - 8, 16, - 32 2、 - 4, 8, - 16, 32, - 64 Write the nth number of each group and calculate the sum of the first eight in each group
• 2. The first number is 64, the second number is 32, the third number is 16, and the fourth number is 8. What is the number n?
• 3. Observe the numbers 1, - 2, - 3,4, - 5,6 in the following column. According to the form shown in the figure, 2013 is the number () on the left of line ()? -1 2 -3 4 -5 6 -7 8 -9 10 -11 12 -13 14 -15 16
• 4. According to a certain rule, it is 1 / 2, 1 / 3, 1 / 10, 1 / 15, 1 / 26, 1 / 35. According to this rule, the seventh number in this column is
• 5. According to a certain rule, the number of a column is 1 / 2, 1 / 3, 1 / 10, 1 / 15, 1 / 26, 1 / 35. According to this rule, what is the seventh number in this column
• 6. Observe the following column of numbers: 1 / 2, 1 / 6, 1 / 12, please find out the rule of arrangement and fill in the blanks according to this rule. (1) the ninth number is () the 14th number is
• 7. Observe the arrangement of the following numbers 1 / 1 1 / 2 2 / 1 1 / 3 2 / 2 3 / 1 1 / 4 2 / 3 3 / 2 4 / 1 1 / 5 The rule is that the denominator is one 2,1 3,2,1 4,3,2,1 . Molecule: 1 1,2 1,2,3 1,2,3,4 . 1. But the m-th number from the left is f (m). When f (m) is 2 / 2001, find the product of the value of M and the m-th number 2. In this column of numbers, the number without reduction and denominator 2 is denoted as C, and the one digit after it is denoted as D. whether there are these two numbers C and D, so that CD = 2 001 000. If there are, find out C and D. if not, please explain the reason
• 8. Here is a set of numbers arranged regularly: 1,3 / 4,2 / 3,5 / 8,3 / 5
• 9. 1,3/4,2/3,5/8,3/5,…… According to a certain rule, find the 100th number___
• 10. A series of numbers are arranged according to the following rule: 1,3,5,2,4,6,3,5,7,4,6,8,5,7,9... From the first number, what is the sum of the first 100 numbers?
• 11. 2,4,8,16,32,64,128…… How to express the nth number of this group of numbers? Good answer plus points (correct question)
• 12. In the rectangular coordinate system, if the coordinates of a and B are known as a (0,1) and B (2,3) respectively, M is a point on the x-axis, and Ma + MB is the smallest, then the coordinates of M are______ ．
• 13. Now there is a column of numbers 2, - 4,8, - 16,32, - 64128 What is the nth number?
• 14. If lgx + lgY = 2, find the minimum value of 1 / x + 1 / y (1 / x) is one in X, and (1 / y) is one in y
• 15. Given that vector group {A1, A2, A3}, {B1, B2, B3} satisfies B1 = a1 + A2, B2 = a1-2a2, B3 = a1 + a2-7a3, it is proved that vector group A is linearly independent If and only if the vector group B is linearly independent
• 16. 1.2.5.10. () 26.37
• 17. How to change the equation: 0.7-x divided by 2 = x-0.25-x divided by 3
• 18. Simplification ratio: 5 / 24 to 1 / 6, 5.6 to 0.7, 1 / 2 to 2 / 3 to 5 / 6
• 19. (2 / 7 + 13 / 9 + 5 / 7) divided by 26 / 3 How much is it
• 20. How to add 8 numbers to 1000?