![](data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0 72 71" width="72"></svg>)
If 7 / △ + 11 / △ = 18 / 131, then △ equals () RT.
Multiply both sides by △ at the same time
7+11=18/131△
△=131
General term formula: 3 / 1,6 / 3,11 / 7,18 / 15
n^2+2
--------
2^n-1
How much is 1 + 3 + 5 + 7 + 11 +. + 201
1 + 3 + 5 + 7 +. + 201, the last number is 201, with (201 + 1) / 2 = 101 numbers in front. The sum of head and tail equals 202 (total 101 / 2 = 50.5 202)
So 1 + 3 + 5 + 7 +. + 201 = 202 * 50.5 = 10201
What is (9 / 7) × 18 / 11?
Simple method
（9/7）*（11/18）=（11/7）*（9/18）=11/14
RELATED INFORMATIONS
- 1. How much is the minimum natural number that meets the requirements
- 2. 38 times 11 equals 306? Give me a hand
- 3. Simply calculate 101 divided by 10 / 111 minus 11 and one tenth
- 4. How many times does the number 8 appear?
- 5. 72x0.81 + 10.4 (simple calculation)
- 6. A and B two cars at the same time from AB two relative departure, a car travel 81 kilometers per hour, B car to complete the whole journey to 10 A and B run from ab at the same time. A runs 81 kilometers per hour. B runs the whole journey in 10 hours. When B runs 13 / 30 of the whole journey, a runs 3 / 8 of the whole journey. How many kilometers are there between a and B?
- 7. If 5 times 0.8 equals 4, can we say that 5 and 0.8 are multiples of 4? Why?
- 8. 0.3x = 45 (solution equation)
- 9. Solving equation 48-3x = 18
- 10. 3x / 4 △ 1 / 6 = 18 (solving equation)
- 11. The product equals 18
- 12. How much is 1000 divided by 10000 plus 200 divided by 3000?
- 13. 3 15 35 63 same term formula
- 14. How can 3795 be combined into a 3-digit division with the largest quotient?
- 15. A number multiplied by 3, plus 27, and then divided by 7, minus 5, and finally divided by 4 to get 1. What's the number? Formula
- 16. One third is a few minutes
- 17. What's three fifths of a third One Minute!
- 18. Write a multiplication formula and a division formula according to 1.8 △ 0.9 = 2______ ，______ ．
- 19. What's 88 times 38
- 20. Two fifths of the number a is five sixths of the number B, the number B is 24, and the number a is ()