#107
1:4/7=1*7/4=7/4
1/6:3/4=1/6*4/3=1/3*2/3=2/9
0,6:0,04=15
1*1/8:2*1/12=9/8:25/12=9/8*12/25=9/2*3/25=27/50
#111
12,6:0,6 i 17,6:0,8 =21>22
2*4/5:4/5 i 9/10:1*1/8=14/5:4/5 i 9/10 :9/8 =14/5*5/4 i 9/10*8/9 = 7/2>4/5
#112
2,4:0,8 i 111:37 =3=3
2*2/5 : 4/5 i 3*1/3:5/6 =12/5*5/4 i 10/3*6/5 =3>4
#113
6:5=x:75
6*75=x*5
450=5x
5x=450
x=90
a:1*7/50=5/57:1/2
a:57/50=5/57:1/2
a*1/2=5/57*57/50
1/2a=1/10
a=1/5
x/0,8=15/4
5x/4=15/4
5x=15
x=3
5-y/4=3/7
7(5-x)=12
35-7x=12
-7x=12-35
-7x=-23
x=23/7