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4+9/2=
13/2= 6,5
La media diferencial de 4 y 9 es 6,5
B) Media proporcional:
4 b
---- = -----= (4*9) (x*x)
b 9
√36=√b² (Sacar raises)
6=b
___________
Respuesta: 6
C) 20, 2/5*1/3=
20, 2*5/1*2=
20, 15/2
20/7,5
2,66
Saludos;