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b)5/8:7/12 = 5/8 * 12/7 = 15/14 = 1 1/14
c)7/8*24/33 = 21/33
d)1 1/8*4/15 = 9/8 * 4/15 = 9/60 = 3/20
e)2 3/5:5 = 13/5 * 1/5 = 13/25
f)1 5/7:6 = 12/7 * 1/6 = 2/7
g)6 1/2:3 1/4 = 13/2 : 13/4 = 13/2 * 4/13 = 2/1 = 2
h)7 1/3:2 2/5 = 22/3 : 12/5 = 22/3 * 5/12 = 55/18 = 3 1/18
i)2 *13*4(pod 13*4 jest kreska ułamkowa 8
13 *4 52
2* --------- = 2 * ------- = 2 * 6,5 = 13
8 8
j)8 3/4*4/7*3 = 35/4 * 4/7 * 3/1 = 15/1 = 15
k)2 1/7*7*2 2/5 = 15/7 * 7/1 * 12/5 = 36/1 = 36
l)4*15*9(kreska ułamkowa 12) = 540 / 12 = 45