Question

\(A=\frac{2x-y}{4x+y}biet\frac{x}{y}=\frac{5}{2}\)

Answer 1

\(\frac{x}{y}=\frac{5}{2}\Rightarrow2x=5y\Rightarrow x=\frac{5y}{2}=\frac{5}{2}y\)

Ta có:

\(A=\frac{2x-y}{4x+y}=\frac{2.\frac{5}{2}y-y}{4.\frac{5}{2}.y+y}=\frac{5y-y}{10y+y}=\frac{4y}{11y}=\frac{4}{11}\)

Vậy A=4/11

Answer 2

khó quá ai giúp mình với 

Answer 3

Ta có: \(\frac{x}{y}=\frac{5}{2}\) => \(2x=5y\)

Thay 2x = 5y vào A, ta có:

A = \(\frac{2x-y}{4x+y}=\) \(\frac{5y-y}{10y+y}\) \(=\frac{4y}{11y}=\frac{4}{11}\)

Vậy A = 4/11

Chúc bạn học tốt !!!