There are two numbers. Their sum is 68.4. The quotient of dividing the two numbers is 11?

There are two numbers. Their sum is 68.4. The quotient of dividing the two numbers is 11?

Let these two numbers be a and B, a > B
Then a is 11 times of B and 68.4 is 12 times of B
So B = 68.4 / 12 = 5.7
A=B*11=62.7

Observe the following numbers and write the numbers on the horizontal line according to the rule: - 2 / 1,5 / 2, - 8 / 3,11 / 4 From this we can judge the number of 2013? Give the reason, hope is the best formula, vulgar easy to understand

The rule of denominator is 1,2,3 N
The molecular law is 2,5,8,11 ,3n-1
Even term is positive, odd term is negative
The tomb of the 2013 number is 2013, and the numerator is 3 × 2013-1 = 6038, which is odd and negative
So the number 2013 is - 6038 / 2013

Find the rule: 2, - 4.6, - 8.10, 12.14, - 16, what are the 55th and 100th numbers?

The nth term expression of this formula is (- 1) ^ (n-1) * 2n
Then item 55 is (- 1) ^ (54) * 110 = 110
Item 100 is (- 1) ^ (99) * 200 = - 200

The following is a sequence of rational numbers: - 2,3,4,5,6 Can you tell the law of arrangement? According to this rule, please write down the number 2008?

-2, 3 of 2, - 4 of - 3, 5 of 4, 6 of - 5
It can be written as:
-2/1,3/2,-4/3,5/4,-6/5,.
So the general formula is (- 1) ^ n * [(n + 1) / N]
So when n = 2008, it is 2009 / 2008

The rational number 1, - 1 / 2,1 / 3, - 1 / 4,1 / 5 According to the following rules: First line 1 The second line - 1 / 2 1 / 3, Third line - 1 / 4 1 / 5 - 1 / 6 The fourth line (1) - 1 / 20 on which line? (2) If the position of - 1 / 6 is recorded as the third number in the third line, what is the fifth number in the tenth row?

Line 3 - 1 / 2 - 1 / 1 / 1 - 17 / 1 / 1 / 1 - 17 / 1 / 1 / 1 - 17 / 1 / 1 / 1 - 17 / 1 / 1 / 1 - 17 / 1 / 1 / 2 - 1 / 1 / 2 - 1 / 2 - 1 / 2 - 1 / 1 / 2 - 1 / 1 / 2 - 1 / 1 / 2 - 1 / 1 / 2 - 1 (1) - 1 / 20 in the sixth line, the fifth 1 + 2 + +9 = 45, the tenth line is - 1 / 45 1 / 46

A column of rational numbers is arranged in the following order: minus two thirds, three quarters, four parts of service, five sixth, and eight seventh Observe the above rules and answer: What is the 100th number? What is the number 2015? It's not four out of five services, it's minus four fifths,

The one you wrote
- 8 / 7
Should be
Six out of seven

Arrange a series of rational numbers according to the following rules and answer the following questions Negative 1 4 → 5 8 → 9 a → B ↓ ↑ ↓ ↑ ↓ ↑ ↓ ↑ 2 → minus 3 6 → minus 7 10 → C → D (1) Is the number at a positive or negative? (2) Where do negative numbers rank in a.b.c.d? (3) Is the number 2010 positive or negative? Where does it rank in a.b.c.d?

(1) Is the number at a positive or negative? Positive
(2) Where are negative numbers in a.b.c.d? B.D
(3) Is the 2010 number positive or negative? Where does it rank in a.b.c.d? Positive. C

If 1 = 4 2 = 8 3 = 16 4 =? How to calculate In fact, it is 1, ha ha

If 1 = 4 has been defined, then 4 = 1;

A question of rational number, 1 + (1 / 2 + 1 / 4 + 1 / 8 + 1 / 16 + 1 / 32 + 1 / 64 + 1 / 128 + 1 / 256) =? How to calculate?

1+（1/2+1/4+1/8+1/16+1/32+1/64+1/128+1/256）=1+(1-1/2+1/2-1/4+1/4-1/8+1/8-1/16+1/16-1/32+1/32-1/64+1/64-1/128+1/128-1/256)=1+(1-1/256)=1+255/256=256/256+255/256=511/256

Find the rule: a column number: 2,0,3, - 1,4, - 2,5,3 Ah ah ah ah ah ah ah ah ah ah ah ah ah ah ah ah ah ah ah ah ah ah ah ah ah ah ah ah ah ah ah ah ah ah ah ah ah ah ah ah ah ah ah ah ah ah ah ah ah ah ah ah ah ah ah ah ah ah ah ah ah ah ah ah ah ah ah ah ah

It should be - 3. That - 10 is the 22nd