Question

1/4+3/7=
1/2-3/8=
3/5+(1/2-0,1)=
4/5-2/15=

Answer 1

1/4+3/7=0,678571429

1/2-3/8=0,125

4/5-2/15=0,666666667

Answer 2

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