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a) 9/4 = x/3
9 . 3/4 = x
6,75 cm
b) 27/12 = 9/t
t = 9.12/27
= 4 cm
c) 27/30 = y/15
27/30 . 15 = y
13,5 cm
d) 12/3 = 5/a
a = 5 . 3/12
= 1,25 cm
^_^