The refrigerator is 2480 yuan and the electric fan is 320 yuan. How much is the refrigerator more expensive than the electric fan?
The answer is 575% (for reference only)
Let: X; have the following formula (1 + X / 100) * 320 = 2480-320, and the solution is x = 575
1 / 3 + 2 / 3 + 1 / 6 + 2 / 6 + 3 / 6 + 4 / 6 + 5 / 6 + 1 / 9 + 2 / 9 + 3 / 9 + 4 / 9 + 5 / 9 + 6 / 9 + 7 / 9 + 8 / 9 +. What is the number in 2011?
A:
When the denominator is 3N, there are 3n-1 terms,
There are 2 + 5 + 8 + +3n-1 = (3N & # 178; + n) / 2 terms
When n = 36 (3N & # 178; + n) / 2 = 19622011
So the denominator of the number 2011 is 3 × 37 = 111, and the numerator is 2011-1962 = 49
So the 2011 number is 49 / 111
The electricity consumption in September is 2 / 7 less than that in August, and the electricity consumption in September is equivalent to several parts of that in August
1-2/7=5/7