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LittleLuna
@LittleLuna
November 2019
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Descubra o valor de x na PA (x+3,2x+2,4x+8)
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Deah
R = a2 - a1
a1 = x + 3
a2 = 2x + 2
a3 = 4x + 8
Para que seja uma PA:
2x + 2 - (x+3) = 4x + 8 - (2x + 2)
2x + 2 - x - 3 = 4x + 8 - 2x - 2
x - 1 = 2x + 6
x - 2x = 6 + 1
-x = 7
x = -7
17 votes
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Lista de comentários
a1 = x + 3
a2 = 2x + 2
a3 = 4x + 8
Para que seja uma PA:
2x + 2 - (x+3) = 4x + 8 - (2x + 2)
2x + 2 - x - 3 = 4x + 8 - 2x - 2
x - 1 = 2x + 6
x - 2x = 6 + 1
-x = 7
x = -7