1/4 *3 2 *7/15 7/18 *2 7*1/8 1/9 *2 2*13/20 1/30*3 3*7/24

Найдем значения выражения:1) 1/4 * 3 = 3/4 = 0,75;2) 2 * 7/15 = (2 * 7)/15 = 14/15;3) 7/18 * 2 = (7 * 2)/18 = (7 * 2)/(2 * 9) = (7 * 1)/(1 * 9) = 7/9;4) 7 * 1/8 = 7/8;5) 1/9 * 2 = 2/9;6) 2 * 13/20 = (2 * 13)/20 = (2 * 13)/(2 * 10) = (1 * 13)/(1 * 10) = 13/10 = 1 3/10;7) 1/30 * 3 = 3/30 = 3/(3 * 10) = 1/(1 * 10) = 1/10;8) 3 * 7/24 = (3 * 7)/24 = (3 * 7)/(3 * 8) = (1 * 7)/(1 * 8) = 7/8.