oblicz 2 1/4 x8= 6 1/9x6= 3 4/5x15= 8 1/21x9= prosze daje naj

2 i 1/4 ·8 = 9/4 ·8 = 18 6 i 1/9 ·6 = 55/9 ·6 = 110/3 = 36 i 2/3 3 i 4/5 ·15 = 19/5 ·15 = 57 8 i 1/21 ·9 = 169/21 ·9 = 507/7 = 72 i 3/7