oblicz : 2/7 razy 7/8 = 1 i 1/2 razy 3/4 =  2 i 3/4 razy4/11 = 3 1/3 razy1 i 1/5 = 2 7/10 razy 5 1/3 5razy 21/30 = oblicz 34 liczby 100

2/7 * 7/8 = 2/8=1/4 1 i 1/2 razy 3/4 = 3/2 * 3/4 = 9/8 = 1 i 1/8 2 i 3/4 razy4/11 = 11/4 * 4/11 = 1 3 1/3 razy1 i 1/5 = 10/3 * 6/5 = 4 2 7/10 razy 5 1/3 =27/10 * 16/3 = 72/5=14 i 2/5 5razy 21/30 = 21/6 = 3 i 3/6 = 3 i 1/2