Question

1/2 + 1/3=? , 1/2+1/3+1/6=?,
1/2- 1/3=? , 5/6-1/2=?

Answer 1

1°]1/2+1/3= 2×1+3×1/2×3=2+3/6=5/6
2°]5/6+1/6=5/6+1/6=6×1+5×6/6×6=6+30/36=36/36 ou 1
3°]1/2-1/3=3×1+2×1/2×3=3-2/6=1/6
4°]5/6-1/2=5×2-6×1/6×2=10-6/12=4/12