1.Calcule x , nas proporções

a)x/2=30/4
b)4/5=x/20
c)20/4=x/2
d)8/32=2/x
e)6/x=3/9

2.Calcule a razão entre :
a)21 e 14
b)15 e 12
c)18 e 12
d)20 e 8
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