Oblicz : ( / to kreska ułamkowa) A) 3/5+1?5 2/6+4/6 2/7+3/7 B) 3/8+18 8/10+1/10 4/9+2/9 C) 6/12+3/12+1/12 2/10+3/10+4/10 3/13+5/13+7/13 D) 3/3+ 2 2/5+ 4 8+3/8

A) 3/5+1/5 = 4/5 2/6+4/6 = 6/6 = 1 2/7+3/7 = 5/7 B) 3/8+1/8 = 4/8 = 1/2 8/10+1/10 = 9/10 4/9+2/9 = 6/9 = 2/3 C) 6/12+3/12+1/12 = 10/12 = 5/6 2/10+3/10+4/10 = 9/10 3/13+5/13+7/13 = 15/13 = 1 i 2/13 D) 3/3+ 2 = 3 2/5+ 4 = 4 i 2/5 8+3/8 = 8 i 3/8