Question

Giúp em với

Answer 1

\(2x=5y\Rightarrow\dfrac{x}{5}=\dfrac{y}{2}\)

Áp dụng t/c dtsbn:

\(\dfrac{x}{5}=\dfrac{y}{2}=\dfrac{3x}{15}=\dfrac{4y}{8}=\dfrac{3x+4y}{15+8}=\dfrac{46}{23}=2\)

\(\Rightarrow\left\{{}\begin{matrix}x=5.2=10\\y=2.2=4\end{matrix}\right.\)

Answer 2

x/5=y/2

3x + 4y/15+8

46/23=2=>x=10

                 y=4

tick nha

 

 

Answer 3

x5=y2=3x15=4y8=3x+4y15+8=4623=2x5=y2=3x15=4y8=3x+4y15+8=4623=2

⇒{x=5.2=10y=2.2=4