1)75-3,75; 2)0,48*25; 3)2/3-2; 4)4/7: 8 5)5 1/2*2/11 6)1 1/7: 1/14 7)-18: (-4,5); 8

1) 75 - 3,75 = 71,25
2) 0,48 * 25 = 12
3) 2/3 - 2 = - (2 - 2/3) = - (1 3/3 - 2/3) = - 1 целая 1/3
4) 4/7 : 8 = 4/7 * 1/8 = (1*1)/(7*2) = 1/14
5) 5 1/2 * 2/11 = 11/2 * 2/11 = (1*1)/(1*1) = 1
6) 1 1/7 : 1/14 = 8/7 * 14 = 8 * 2 = 16
7) - 18 : (-4,5) = 4