1/4+3/7=0,678571429
1/2-3/8=0,125
4/5-2/15=0,666666667
7/28+12/28 = 19/28
4/8-3/8 = 1/8
0.6+0.4=1
12/15-2/15=10/15=1/3
1/4+3/7=0,678571429
1/2-3/8=0,125
4/5-2/15=0,666666667
7/28+12/28 = 19/28
4/8-3/8 = 1/8
0.6+0.4=1
12/15-2/15=10/15=1/3