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Deividyfreitas
@Deividyfreitas
April 2020
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Sabendo que (x + 1)2 , 7x
e 9x -1 são nessa ordem, três termos consecutivos de uma progressão aritmética
crescente, pedem-se:
a) O valor de x;
b) A soma dos 50 primeiros
termos :
va aqui a sua pergunta
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naimathie
PA = (x+1)2, 7x, 9x-1
r = 7x - (x+1)2 = 9x-1 - 7x
r = 7x - 2x - 2 = 9x - 1 - 7x
r = 3x = 1
r = 1/3
7x + 1/3 = 9x - 1
1 + 1/3 = 2x
4/3 / 2 = x
x = 4/6
x = 2/3
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r = 7x - (x+1)2 = 9x-1 - 7x
r = 7x - 2x - 2 = 9x - 1 - 7x
r = 3x = 1
r = 1/3
7x + 1/3 = 9x - 1
1 + 1/3 = 2x
4/3 / 2 = x
x = 4/6
x = 2/3