Dodawanie i odejmowanie ułamków zwykłych . Prosze nie o same wyniki lecz o całe działanie 4 2/3 - 1 1/6 ---- 5 5/6 - 3 7/8 ------- 5 12/25 - 2 17/20 ------ 6 11/12 - 4 5/8 -------- 3 5/9 - 1 8/10 ------- 7 11/18 - 5 11/12 . Plis pomocy ;)

1. 4 2/3 - 1 1/6 = 4 4/6 - 1 1/6 = 3 3/6 = 3 1/2 2. 5 5/6 - 3 7/8 = 5 20/24 - 3 21/24 = 4 44/24 - 3 21/24 = 1 23/24 3. 5 12/25 - 2 17/20 = 5 48/100 - 2 85/100 = 4 148/100 - 2 85/100 = 2 63/100 4. 6 11/12 - 4 5/8 = 6 22/24 - 4 15/24 = 2 7/24 5. 3 5/9 - 1 8/10 = 3 50/90 - 1 72/90 = 2 140/90 - 1 72/90 = 1 68/90 = 1 34/45 6. 7 11/18 - 5 11/12 = 7 22/36 - 5 33/36 = 6 58/36 - 5 33/36 = 1 25/36

4 i 2/3 - 1 i 1/6= 4 i 4/6 - 1 i 1/6= 3 i 3/6= 3 i 1/2 5 i 5/6 - 3 i 7/8 = 5 i 20/24 - 3 i 21/24 = 4 i 44/24 - 3 i 21/24= 1 i 23/24 5 i 12/25 - 2 i 17/20 = = 5 i 28/100 - 2 i 85/100 =   = 4 i 128/100 - 2 i 85/100 =  = 2 i 43/100 6 i 11/12 - 4 i 5/8 = 6 i 22/24 - 4 i 15/24= 2 i 7/24 3 i 5/9 - 1 i 8/10 = =3 i 50/90 - 1 i 72/90 = =2 i 140/90 - 1 i 72/90 = =1 i 68/90 =  = 1 i 39/45 7 i 11/18 - 5 i 11/12= = 7 i 22/36 - 5 i 33/36= = 6 i 58/36 - 5 i 33/36= = 1 i 25/36