Выполните деление: 2:1/7, 4:2/3, 1:1/3, 1:1/4, 4/9:2, 3/5:2, 3 1/2:2 1/3, 5 1/2:3 2/3, 16/21:20/49, 1 5/11:8/33, 1 1/2:3 Помогите пж

2:1/7=2*7/1=2*7=14
4:2/3=4*3/2=2*3=6
1:1/3=1*3/1=1*3=3
1:1/4=1*4/1=4
4/9:2=4/9*1/2=2/9*1/1=2/9
3/5:2=3/5*1/2=3/10
3 1/2:2 1/3=7/2:7/3=7/2*3/7=3/2=1 1/2
5 1/2:3 2/3=11/2:11/3=11/2*3/11=3/2=1 1/2
16/21:20/49=16/21*49/20=4/21*49/5=4/3*7/5=28/15=1 13/15
1 5/11:8/33=16/11:8/33=16/11*33/8=2/11*33/1=2/1*3/1=2*3=6
1 1/2:3=3/2*1/3=1/2*1/1=1/2