The rule of number is: 1, 3, 6, 10, 15, 21. Find the difference between the 24th number and the 22nd number

forty-seven

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1. 1 3 7 15 what are the six numbers in this order? What is the tenth number
2. 1+3+6+10+15+…… What's the law of life
3. It is known that a, B and C are all nonnegative numbers and satisfy the equations 3A + 2B + C = 5 and 2A + b-3c = 1. If M = 3A + b-7c, the maximum and minimum values of M are obtained Tip: apply inequality knowledge.
4. Given that real numbers a, B, C satisfy a + C = 6-4b + 3B ^ 2, C-A = 4-4b + B ^ 2, then the size relation of ABC is
5. In △ ABC, ∠ C = 90 ° 4B2 + 3c2 = 43bc, can we find the degree of ∠ a? If you can, work it out. If you can't, explain the reason
6. The problem-solving process of (a-2b + 3C) & Seven under the colorful holiday life
7. Given 4B = 3b, 2b = 3C, find a: B = (): () B: C = (): () a: C = (): () Given 4A = 3b, 2b = 3C, find a: B = (): () B: C = (): () a: C = (): ()
8. In the triangle ABC, a, B and C are the opposite sides of three internal angles a, B and C respectively, and a, B and C are not equal to each other. Let a = 4, C = 3 and a = 2C 1. Find the value of COSC 2. Find the value of B
9. Exponential formula is written as logarithmic formula: 4 ^ x = 1 / 6; 4 ^ x = 2. Please write the process. I just learned logarithm, Don't you have to write x = how much
10. 1. If two straight lines a and B are different, how can the plane passing through a and perpendicular to B not exist? I don't know. How can there be one? 2. The side of a pyramid is a triangle with a common vertex. If the side of a pyramid is an equilateral triangle, how many side triangles does the pyramid have at most? What is a triangle with a common vertex? What does it look like-
11. There is a column of numbers: 1, 3, 6, 10, 15, 21... What is the nth number?
12. 1→3 2→6 3→10 4→15 5→21 … … The law of finding formula
13. 1. 2; 3; 4; 5; 6; 7. N 1; 2; 3; 4; 5; 6; 7 ........n 0; 1; 3; 6; 10; 15; 21 ........( )
14. Please observe the law of the following numbers and fill in the appropriate numbers in brackets according to the law: 1,2,3,5,8,13,21, (), 55,89?
15. Look at the numbers 1, 3, 6, 10, 15, 21, 28, 1 According to the law, what is the number from one to the hundredth? What is the number in 2009?
16. Observe the number in the following column, 1,3,6,10,15,21. According to this rule, its number 2004 is
17. Observe the number of the following column, 1.3.6.10.15.21... According to this rule, what is its number in 2004
18. Mathematical solution; write numbers according to the law; 0,1,3,5,8,21,55, (--, --, --, --,)
19. What are the rules of 3, 6, 10, 15 and 21?
20. The rule of 0 1 3 6 10 15 21 28 36 (expressed by n),,,,, you prawns are bubbling ,,,,,, n denote