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PenhaFerreira1
@PenhaFerreira1
December 2019
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7) (EPCAR- 2012)
Considere os números reais a, b e c tais que:
A+b = x ,a -b = x^-1
A diferente b diferente 0, o valor da expressão.
A)2
B) 2x^2
C) x^2
D) x^2/2
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kepler1
A^2-b^2=(a-b)(a+b)
a^3-b^3=(a-b)(a^2+ab+b^2)
(a+b)^2=a^2+2ab+b^2
(a+b)^2(a-b)(a^2+ab+b^2)/(a-b)(a+b)(a^2+ab+b^2)/a(a-b)/2a
(a+b)^2/(a+b)/(a-b)/2
(a+b)/(a-b)/2
2(a+b)/(a-b)
2x/x^-1
2x/1/x
2x.x/1=2x^2
letra B.
3 votes
Thanks 8
PenhaFerreira1
muito obrigada, me ajudou bastante
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Lista de comentários
a^3-b^3=(a-b)(a^2+ab+b^2)
(a+b)^2=a^2+2ab+b^2
(a+b)^2(a-b)(a^2+ab+b^2)/(a-b)(a+b)(a^2+ab+b^2)/a(a-b)/2a
(a+b)^2/(a+b)/(a-b)/2
(a+b)/(a-b)/2
2(a+b)/(a-b)
2x/x^-1
2x/1/x
2x.x/1=2x^2
letra B.