Question

[Khuc nhac mat troi]

Tìm 2 số x,y biết:

\(\frac{x-y}{3}=\frac{x+y}{13}=\frac{xy}{200}\)

Answer 1

[OoO Kún Chảnh OoO]

Tu x+y/13=x-y/3

=> 3(x +y) = 13(x-y)

=> y = 5x/8

Tu x-y/3=xy/200

=> 200(x-y) = 3xy

=> 200(x - 5x/8) = 3x.5x/8

=> x^2 - 40x

=> x(x-40) = 0

=> x = 0 hoac x = 40.

 Voi x = 0 ta co y = 0

Voi x = 40 ta co y = 25