szybko!! chociaż zad 1 lub 2 1.oblicz sumę wynik doprowadź do najprostszej postaci: a) 3/7+2/14 b) 3/4+2/3 c) 3/8+5/6 d) 3 1/5+4 2/4 e) 11 7/9+8 5/12 f) 1 1/3+ 4 3/4+ 1/12 2.oblicz różnicę, wynik doprowadź do najprostszej postaci: a) 5/6-5/12 b) 3/5-

zad 1 a) 3/7 + 2/14 = 6/14 + 2/14 = 8/14 = 4/7 b) 3/4 + 2/3 = 9/12 + 8/12 = 17/12 = 1  5/12 c) 3/8 + 5/6 = 9/24 + 20/24 = 29/24 = 1 5/24 d)3 1/5 + 4 2/4 = 3 4/20 + 4 10/20 = 7 14/20 = 7 7/10 e) 11 7/9 + 8 5/12 = 11 28/36 + 8 15/36 = 19 43/36 = 20 7/36 f) 11/3 + 4 3/4 + 1/12 = 33/12 + 4 9/12 + 1/12 = 4 54/12 = 8 6/12 = 8 1/2 zad 2 a) 5/6 - 5/12 = 10/12 - 5/12 = 5/12 b) 3/5 - 1/3 = 9/15 - 5/15 = 4/15  c) 8/9 - 5/6 = 16/18 - 15/18 = 1/18  d) 2 2/3 - 1/4 = 2 8/12 - 3/12 = 2 5/12 e) 4 3/7 - 1/4 = 4 12/28 - 7/28 = 4 5/28 f) 12 5/9 - 7 13/15 = 12 25/45 - 7 39/45 = 4 31/45  liczę na naj :)

3/7+2/14=6/14+2/14=8/14=4/7           3/4+2/3=6/12+8/12=14/12=1 2/12=1 1/6  3/8 + 5/6=18/48 + 40/48=58/48= 1 10/48=1 5/24      3 1/5 + 4 2/4=3 4/20+4 10/20 =7 14/20 =7 7/10        11 7/9+8 5/12=11 84/108+8 45/108= 19 129/108 =1 21/108       1 1/3+ 4 3/4+1/12=1 4/12+4 9/12 +1/12=5 14/12=6 2/12 =6 1/6