2/3÷10;4/5÷8;5/6:10;3/7÷12;

2/3:10=15/1=15
4/5:8=10/1=10
5/6:10=12/1=12
3/7:12=4/1=4

1) 2/3÷10= 2/3 * 1/10= 1/6
2) 4/5÷8 = 4/5 * 1/8 = 1/10 = 0,1
3) 5/6÷10 = 5/6 * 1/10 = 1/12
4) 3/7÷12 = 3/7 * 1/12 = 1/28