1. Here (the length of the whole road) is regarded as the unit "1"; Repaired roads account for four-sevenths of the total length; The relationship is as follows: (Total fixed ratio =4 to 7) If "1" appears in the question, the total amount should be filled in, so it depends on the total amount. 22. After the dairy scandal in 2008, the price of a certain brand of milk powder dropped by one fifth, and the original price and current price (four fifths) dropped by one fifth, that is, one fifth less, so what remained was 1 minus one fifth to four fifths. In a city, the number of families connected to the Internet this year has increased by three tenths compared with last year. The number of internet users this year is 13/10 of last year's, and it turned out to be 10. Three tenths more than the original, that is, three points more, adding up to 13 points, and 13 points are thirteen tenths more than the original 10 points.