Question

alguem me pode resolver? m pode ser qualquer valor

$\left \{ {{ \frac{m}{x} - \frac{m}{y} = \frac{m}{40} } \atop { \frac{m}{x} + \frac{m}{y} = \frac{m}{72} }} \right.$

Answer 1

Boa tarde Henistein

m/x - m/y = m/40 
m/x + m/y = m/72 

1/x - 1/y = 1/40
1/x + 1/y = 1/72

2/x = 1/40 + 1/72
2/x = (72 + 40)/(40*72)
x/2 = 2880/112
x = 2880/56 = 360/7 

7/360 + 1/y = 1/72
7/360 + 1/y = 5/360
1/y = -2/360 = -1/180 

y = -180 

S = (360/7, -180)