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a)6/7x 5/8 =30/42
b2/8x5/9=10/72=
c)4/19x2 3/8=4/19* 19/8=76/152=0,5
d)3 3/8x8/9=27/8*8/9=3
e)7/11x12/24 =7/22
f)1 1/2x2/3=1/3
g)3 1/5x2 1/4=9/20
h)1/9x9 1/2=19/18
i)3/7:7/3=1
j)4 1/5:7/10=10/35
k)1/2:1 1/4=2
l)1 1/8:8=1/64
m)4/8:1/2=2/8
n)3 3/11:3=36/11*1/3=36/33
o)2 3/7:4 6/7=16/7* 34/7=544/49