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Flecha
@Flecha
October 2020
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{x+y= 5/6
{x²+3y= 5/4
Quanto é?
Fiz meus cálculos aqui e deram:
x: 5/2 ; y: -5/3
x: 1/2 ; y: 1/3
Está correto?
1
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3478elc
3478elc
{x+y= 5/6 ==> y = 5/6 - x
{x²+3y= 5/4
x²+3(5 - x)= 5 mmc = 12
6 4
12x² + 6(5-x) - 15 = 0
12x² + 30 - 6x - 15 = 0
12x² - 6x + 15 = 0 (:3)
4x² - 2x + 5 = 0
Δ=(-6)² - 4.4.15==> 36 - 260 = - 224 raízes imaginárias
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