Question

вычислите: 12 +13 , 13-14 , 14+15 , 15-16 , 16+17 , 17-18

Answer 1

1/2+1/3=3+2/6=5/6
1/3-14=13(2/3)
1/4+1/5=9/20
1/5-1/6=1/30
1/7-1/8=1/56