Вычеслите 3/8+1/8, 2/3+1/4, 1/10+3/100, 2/3+1/12, 5/6+5/9, 3/20+7/30.

3/8+1/8=4/8=1/2=0,5
2/3+1/4=8/12+3/12=11/12
1/10+3/100=10/100+3/100=13/100=0,13
2/3+1/12=8/12+1/12=9/12=3/4=0,75
5/6+5/9=15/18+10/18=25/18=1 7/18
3/20+7/30=9/60+14/60=13/60