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a)
3/4 = x/8
8 × 3/4 = x
24/4 = x
6 = x
b)
2/n = 8/32
2 × 32 = 8n
64 = 8n
64/8 = n
8 = n
c)
4/5 = 12/m
4m = 12 × 5
4m = 60
m = 60/4
m = 15
d)
A/5 = 6/15
15A = 5 × 6
15A = 30
A = 30/15
A = 2
e)
20/X = 6/15
20 × 15 = 6x
300 = 6x
300/6 = x
50 = x
f)
7/14 = Y/10
7 × 10 = 14Y
70 = 14Y
70/14 = Y
5 = Y
Espero que te ayude.
Saludos!!!