1)=14*10/25*49=140/1225=4*35/35*35=4/35,
2) = 13*100/10*39=1300/390=10*130/3*130=10/3=3 1/3,
3)= 15*7/14*12=105/168=5*21/8*21=5/8,
4)=45*17/34*15=765/510=3*255/2*255=3/2=1 1/2
<span>53+17=70 100-45=55</span>
48+12=60 100-23= 67
39+11=50 100-15=85
24+16=40 100-32= 68
9+21=30 100-54=46