Выполните действие 1/8 +1/4 ; 2/3-5/9; 1/2-5/12; 5/12-2/9; 1/8+7/12; 3/4-1/6; 5/9+3/4; 23/40-3/8; 9/35-3/28

1/8+1/4=1+2/8=3/8
2/3-5/9=6-5/9=1/9
1/2-5/12=6-5/12=1/12
5/12-2/9=15-8/36=7/36
1/8+7/12=3+14/24=17/24
3/4-1/6=9-2/12=7/12
5/9+3/4=20+27/36=47/36=1 11/36
23/40-3/8=23-15/40=8/40=1/5
9/35-3/28=36-15/140=21/140=3/20