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natima [27]
3 years ago
6

Chứng minh rằng S= 5+ 5^2 + 5^3 + ...+ 5^1991 + 5 ^1992 chia hết cho 6

Mathematics
1 answer:
marin [14]2 years ago
3 0

Answer:

steps below

Step-by-step explanation:

5¹+5² = 30        30/<u>6</u> = 5¹

5³+5⁴ = 125 + 625 = 750     750/<u>6</u> = 125 = 5³

5⁵+5⁶ = 18750         18750/6 = 3125 = 5⁵

...........

(5¹⁹⁹¹+5¹⁹⁹²)/<u>6</u> = 5¹⁹⁹¹

sum of every couple consecutive multiple of 5 are multiple of 6, the sum

S= <u>5+ 5^2</u> + 5^3 + ...+ <u>5^1991 + 5 ^1992</u> IS multiple of 6

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Ksivusya [100]
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remember that normal means perpendicular
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we just need the slope

take derivitive
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7 0
3 years ago
In the opening scene of the movie Raiders of the Lost Ark, Indiana Jones replaces a golden statue with a bag of sand. The platfo
chubhunter [2.5K]

Answer:

1920π

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Now, you need to find the volume. Since the sand has to weigh the same as the statue, the mass is going to stay the same. To find the volume you need to do:

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1920π

Note: I had to do the exact same problem on Khan Academy. This is right.

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