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m-2m-3m+4m-5m-6m= m-2m-3m+4m-5m-6m+···+2002m-2003m-2004m
m-2m-3m+4m-5m-6m+···+2002m-2003m-2004m
= [(1-2-3)+(4-5-6)+···(2002-2003-2004)]m
= -(4+7+11+···+2005)m
= -668*(4+2005)m/2
= -671006m
Arithmetic sequence formula:
Sn=n(a1+an)/2
an=a1+(n-1)d
Factorization of 3ax to the third power-108ax
3ax³-108ax
=3ax(x²-36)
=3ax(x-6)(x+6)
Factorization x ^ 3 + 3ax ^ 2 + (3a ^ 2-B ^ 2) x + a (a ^ 2-B ^ 2)
RELATED INFORMATIONS
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- 8. In maple, how to simplify the symbolic equation by substituting it into the equation? It's not a complicated problem Let z = a + BX / y, where M = x / y. find Z (m) Using Maple, we should get z = a + BM But which command of maple?
- 9. It is known that x ≤ - 3, and the reduction is: | - x | + │ X-2 │ - │ X-5 │
- 10. When x_ When | X-5 | = 5-x is known as 1 | x | 3, simplify | X-1 | + | x-3|=
- 11. Solving the fractional equation: X-1 / x + 2 = x-3 / x + 4
- 12. Is an equation that uses other letters to represent an unknown number
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- 14. As shown in the figure, after the triangle on the left is reduced to a certain scale, the triangle on the right can be obtained. Find the unknown X. unit (CM)
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- 16. If the bracket x + y = 3, X-my = 2 and the bracket X-Y = 1, nx-y = 2 have the same solution, find the value of M, n?
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- 20. A math problem, do not have two unknown equations, to sixth grade pupils to accept the method, by the way, explain, hard you! In order to save resources and protect the environment, a city's Electric Power Bureau has been replacing Gufeng meters for residents for free since January this year, and then stipulates that: from 8:00 to 21:00 every day, 0.80 yuan per kilowatt hour ("peak electricity" price); from 21:00 to 8:00 the next day, 0.55 yuan per kilowatt hour (valley electricity price). At present, residents who do not use Gufeng meters charge 0.75 yuan per kilowatt hour, In March, we paid 91.5 yuan for electricity. After calculation, we can save 6 yuan by using peak valley electricity meter. 1. How many kilowatt hours does the small owner use in March? 2. How many kilowatt hours did the "peak electricity" and "valley electricity" use in March? We can't find it online, so please help us. It's hard to get the answer before 11 o'clock