UnderChot UnderChot

13-09-2016
Mathematics

contestada

Qual o valor numérico da expressão a ³-2a² +5a, para a= 2/3

Respuesta :

Kunchan Kunchan

13-09-2016

a ³-2a² +5a
(2/3)^3 - 2(2/3)^2 + 5(2/3)
(8/27) - 2(4/9) + (10/3)
(8/27) - (8/9) + (10/3)
(8 - 24 + 90) / 27
(98 - 24) / 27
74 / 27

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