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Bikaa
@Bikaa
October 2020
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determine o 7° termo da PG (x+2,x,x-1) ?
obs: conta completa
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Verified answer
(x+2,x,x-1)
x = x - 1
x + 2 x
x
² = (x + 2)(x - 1)
x² = x² -x +2x - 2
x² - x² + x - 2x = - 2
-x = - 2 (-1)
x = 2
1) x+ 2 = 2 + 2 ==> 4
2)x = 2
3)x-1 = 2 - 1 ==> 1
(4, 2, 1, .....)
a7 = 4.(1)^6
2
a7 = 2^2 ==> a7 = 2^2.2^-6 ==>
a7 = 2^-4 ou a7 =
1
2^6
16
2 votes
Thanks 6
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Verified answer
(x+2,x,x-1)
x = x - 1
x + 2 x
x² = (x + 2)(x - 1)
x² = x² -x +2x - 2
x² - x² + x - 2x = - 2
-x = - 2 (-1)
x = 2
1) x+ 2 = 2 + 2 ==> 4
2)x = 2
3)x-1 = 2 - 1 ==> 1
(4, 2, 1, .....)
a7 = 4.(1)^6
2
a7 = 2^2 ==> a7 = 2^2.2^-6 ==> a7 = 2^-4 ou a7 = 1
2^6 16