А)
0,75 : 3/5 = 75/100 : 3/5 = 75/100 * 5/3 = 25/20 = 5/4 = 1 1/4,
б)
0,625 : 5/8 = 625/1000 : 5/8 = 625/1000 * 8/5 = 125/125 = 1,
в)
9/15 : 5/8 : 0,64 = 9/15 : 5/8 : 64/100 = 9/15 * 8/5 * 100/64 = 60/40 =
= 3/2 = 1 1/2,
г)
13/14 : 6,5 : 11/130 = 13/14 : 65/10 : 11/130 = 13/14 * 10/65 * 130/11 = = 130/77 = 1 53/77