In 1 / 1,1 / 2,2 / 2,2 / 3,3 / 3,1 / 4,2 / 4,3 / 4,4 / 4,..., what fraction is 7 / 8? What fraction is 50

In 1 / 1,1 / 2,2 / 2,2 / 3,3 / 3,1 / 4,2 / 4,3 / 4,4 / 4,..., what fraction is 7 / 8? What fraction is 50

Because: denominator is 1 of 1, 2 of 2, 3 of 3
1. So the number before 7 / 8 is: 1 + 2 + 3 + 4 + 5 + 6 + 7 + the denominator is the first 7 numbers of 8 = 35
2. Because 50 can be divided into 45 + 5 (1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 = 45), there are only 5 numbers with denominator 10, and the last one is 5 / 10

According to the number of factors, natural numbers can be divided into prime numbers, composite numbers and 1,

Yes

Given that sin (PIE + a) = half, what is the value of COS (three-thirds pie-a)

A = - pi / 6 + 2kpi or - 5pi / 6 + 2kpi
Cos (3 / 2-A) = - √ 3 / 2 or 0

Shenzhou-7 is not 468km per minute. How many kilometers can it fly in 8 / 9 minutes? How many minutes does it take to fly 702km?

Eight out of nine can fly 416km, and it takes three out of two minutes to fly 702km

According to the rule of this figure, it goes on to 1 234 56789 10111213141516 The m-th number in the n-th row is (expressed by the algebraic expression of N, n > m)
The number 2002 in line 2001 is:
one
two hundred and thirty-four
fifty-six thousand seven hundred and eighty-nine
ten trillion and one hundred and eleven billion two hundred and thirteen million one hundred and forty-one thousand five hundred and sixteen

Line 1 -- first 0 ^ 2 + 1, total 1
Line 2 - the first 1 ^ 2 + 1, total 3
Line 3: the first 2 ^ 2 + 1, 5 in total
Line 4 - the first 3 ^ 2 + 1, total 7
Line 5: 9 from the first 4 ^ 2 + 1
*
*
Line n: first (n-1) ^ 2 + 1, 2N-1 in total
The m-th is (n-1) ^ 2 + 1 + M-1 = (n-1) ^ 2 + M

Integers are natural numbers, right

No, integers include negative integers, 0 and positive integers
Natural numbers include 0 and positive integers

Junior high school mathematics problems in the first semester (- 5) + (+ 12) + (- 7) (- 11) + (+ 36) =?

The answer is 25

The sum of four consecutive natural numbers is a three digit number between 400 and 440, and the sum can be divisible by 9. It is necessary to find the four consecutive natural numbers______ 、______ 、______ 、______ ．

According to the above analysis, only 414 numbers can be divided by 9 between 400 and 440. Let the minimum natural number be X. according to the meaning of the question, we get x + X + 1 + X + 2 + X + 3 = 414, & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; 4x + 6 = 414, & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; 4x = 414-6, & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; X = 408 △ 4, & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; X = 102, x + 1 = 102 + 1 = 103, x + 2 = 102 + 2 = 104, x + 3 = 102 + 3 = 105. A: these four continuous natural numbers are 102103104105. So the answer is: 102103104105

How to calculate n-th root in Excel

There is a function power () in excel that returns the power of a given number
When the exponent is a fraction, it returns the square root of a given number
The function has two arguments in parentheses, the first is the base and the second is the exponent, separated by commas
give an example:
=Power (5,2) -- returns the second power of 5
=Power (81,1 / 4) -- returns the fourth root of 81
Note: parameters can be referenced by cell address
As far as general operations are concerned, they can be directly expressed as follows:
=81^(1/4)

There is a batch of goods in the warehouse. The weight ratio of the goods transported away and the remaining goods is 2:7. If 64 tons are transported away, the remaining goods are only 3 / 5 of the original goods in the warehouse?

2 (2 + 7) = 2 / 9 of the total number transported for the first time
1-3=2/5
original
64÷(2/5-2/9)
=64÷8/45
=360 tons
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