zad. 11
a) 1 1/3 * 9/11 = 4/3 * 9/11 (to trzeba skrócić 9 i 3 przez 3 wtedy będzie: 3/1 * 3/11) = 12/11 = 1 1/12
4 3/14 * 7 = 3/56 * 7 = 3/8 ( bo skracasz 7 i 56 przez 7)
b) 15 * 3 1/5 = 15 * 16/1 = 48/1 = 48
3 2/3 * 1/15 = 11/3 * 6/5 = 22/5 = 4 2/5
zad. 12
a) 5/7 : 3 = 5/7 * 1/3 = 5/21
6 : 2 1/5 = 6 : 11/5 = 6 * 5/11 = 30/11 = 2 8/11
7 2/6 : 9 = 44/6 : 9 = 44/6 * 1/9 = 44/54 = 22/27
b) 2/3 : 3/5 = 2/3 * 5/3 = 10/9 = 1 1/9
3 3/7 : 5/8 = 24/7 : 5/8 = 24/7 * 8/5 = 192/35 = 5 17/35
1 3/4 : 1 3/5 = 7/4 : 8/5 = 7/4 * 5/8 = 35/32 = 1 3/32
zad.13
a) 2/5//4/15 = 2/5 : 4/15 = 2/5 * 15/4 = 3/2 = 1 1/2
b) 3//1/5 = 3 : 1/5 = 3 * 5/1 = 15/1 = 15
c) 3/4//5 = 3/4 : 5 = 3/4 * 1/5 = 3/20
zad.14
a) 4 (ponieważ, 2/7 = 4/14)
b) 60 (ponieważ, 3/5 = 30/50 = 60/100)
c) 18 (ponieważ, 3/5 = 18/30)
Liczę na naj, bo się serio starałam '>'
