3.1/6+2.2/3, 8.5/7+2.1/14, 1.5/16+1.1/2,6.7/10+9.5/20 решите

1) 3.1/6+2.2/3=3.1/6+4.4/6=7.5/6=1.25
2) 8.5/7+2.1/14=17/14+2.1/14=19.1/14=
3) 1.5/16+1.1/2=1.5/16+8.8/16=10.3/16=103/160
4) 6.7/10+9.5/20=13.4/20+9.5/20=22.9/20=229/200