3/9 + 5/54=
6/36 + 2/6=
4/6 + 1/4=
7/8 + 2/9=
9/81 + 6/9=
4/12 + 8/2=

3/9+5/54= 18/54+5/54=23/546/36+2/6=1/6+1/3=1/6+2/6=3/6=1/24/6+1/4= 2/3+ 1/4= 8/12+3/12=11/127/8+2/9= 63/72+16/72= 79/72= 1 (целая) 7/729/81+6/9= 1/9+ 2/3= 1/9+6/9=7/94/12+8/2= 1/3+ 4 (целое)= 4 (целых) 1/3