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56242
@56242
December 2019
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Determine a quarta proporcional dos números abaixo:
a) 4, 9 e 12
b) 5, 3 e -10
c) 0,4; 0,5 e 1,6
d) 1/2, 1/5 e 3/4
e) 3, 8 e 0,15
f) 2, 1/8 e -0,4
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albertrieben
Boa noite
a)
4/9 = 12/x
4x = 108
x = 108/2 = 54
b)
5/3 = -10/x
5x = -30
x = -30/5 = -6
c)
0.4/0.5 = 1.6/x
0.4x = 0.8
x = 2
d)
(1/2)/(1/5) = (3/4)/x
x/2 = 3/12
x = 6/12 = 1/2
e)
3/8 = 0.15/x
3x = 1.2
x = 1.2/3 = 0.4
f)
2/(1/8) = -0.4/x
16 = -0.4/x
16x = -0.4
x = -0.4/16 = -4/160 = -0.025
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Lista de comentários
a)
4/9 = 12/x
4x = 108
x = 108/2 = 54
b)
5/3 = -10/x
5x = -30
x = -30/5 = -6
c)
0.4/0.5 = 1.6/x
0.4x = 0.8
x = 2
d)
(1/2)/(1/5) = (3/4)/x
x/2 = 3/12
x = 6/12 = 1/2
e)
3/8 = 0.15/x
3x = 1.2
x = 1.2/3 = 0.4
f)
2/(1/8) = -0.4/x
16 = -0.4/x
16x = -0.4
x = -0.4/16 = -4/160 = -0.025