It is known that the sum of three continuous natural numbers is less than 12. How many groups of such natural numbers are there in total? We use one variable linear inequality

It is known that the sum of three continuous natural numbers is less than 12. How many groups of such natural numbers are there in total? We use one variable linear inequality

(a-1)+a+(a+1)

If the sum of three consecutive natural numbers is known to be less than 20, then such natural numbers are common______ Group

Let the middle natural number be x, from the meaning of the question, X − 1 ≥ 03x < 20, the solution is: 1 ≤ x < 203, there are six middle natural numbers in line with the meaning of the question, that is, there are six groups of such natural numbers. So the answer is: 6

The sum of three continuous natural numbers is less than 15. How many groups of such natural numbers are there? Write out the solution
Write down the solution

Let the middle number be x, then the three numbers are X-1, x, x + 1, respectively
x-1+x+x+1

The sum of three consecutive natural numbers is less than 13. How many groups are there?

Solution:
The sum of three continuous natural numbers is three times of the middle number = 3N (n is the middle number)
3n

What is the value of sin70 ° sin65 ° - sin20 ° sin25

Solution
sin70sin65-sin20sin25
=sin70cos25-cos70sin25
=sin(70-25)
=sin(45)
=√2/2

25 / 2 is 2 / 7 less than 2 / 5 of a number
A piece of land uses two fifths of its cabbage, and the rest grow radish and tomato according to the ratio of 3:4. How many parts of the land do radish and tomato grow respectively? Xiaoming read a book, one fifths of the whole book on the first day, 14 more pages on the second day than on the first day, and the remaining 13 pages on the third day. How many pages are there in this book? There are () lines on the circle at both ends, of which () is the longest

25 / 2 is 2 / 7 less than 2 / 5 of a number. Find the number (using the solution of the equation). Let x (2 / 5) x-25 / 2 = 7 / 2 (2 / 5) x = 16 x = 40. For a piece of land, use 2 / 5 of its cabbages, and the rest grow radish and tomato in the ratio of 3:4. How many parts of the land do radish and tomato grow

Let Tan α = 1 α ∈ (0,2 π) find α

∵tanα=1 ＞0 α∈(0,2π）
In the first quadrant and the third quadrant
∴α=π/4 α=π+(π/4)=5π/4

In the triangle ABC, ∠ C = 90 °, ab = 4, ∠ ABC = 30 ° move the triangle ABC 4 units along the direction of the line PQ to the triangle a 'B' C‘
1 find the length of a'c ',
2 find the degree of ∠ b'a'c '
3 find the perimeter of the quadrilateral ABB 'a'

1.A'C'=AC=2
2.∠B'A'C'=∠BAC=60
3. ABB'a 'perimeter is 16

How many hours and seconds is 18858 seconds equal to

1 hour = 60 × 60 = 3600 seconds
18858÷3600=5…… eight hundred and fifty-eight
858÷60=14…… eighteen
18858 seconds = 5 hours 14 minutes 18 seconds

If the sum of the intercept of the line 3x-4y + 2K = 0 on the two axes is 2, then the real number k =?

If x = 0, then y = K / 2
If y = 0, then x = - 2K / 3
Absolute value x + y = 2
Slope = 4 / 3
So X-Y = 2
k/2-2k/3=2
k=-12
Or Y-X = 2
k=12