02 Oct 2013, 02:32
Na equação \(\frac{3}{2}x - \frac{1}{4}y = \frac{7}{8}\) , se y = - 2, então o valor de x é:
02 Oct 2013, 08:52
\(\frac{3}{2}x - \frac{1}{4}(-2) = \frac{7}{8}\)
\(\frac{3}{2}x + \frac{1}{2} = \frac{7}{8}\)
\(\frac{3}{2}x = \frac{7}{8}-\frac{1}{2}\)
\(\frac{3}{2}x = \frac{7}{8}-\frac{4}{8}\)
\(\frac{3}{2}x = \frac{3}{8}\)
avance...
dúvidas diga...
02 Oct 2013, 08:57
Vamos lá:
x 3/2 - (-2) 1/4 = 7/8
x 3/2 + 2/4 = 7/8
x 3/2 = 7/8 - 1/2 (Simplifiquei o 2/4)
x 3/2 = 7/8 - 4/8
x 3/2 = 3/8
x = 3.2 / 8.3
X = 2/8 .:. x= 1/4 ou 0,25
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