Question

Tìm các số x.y biết x÷5=y÷2 và x-

Answer 1

b,Ta có:

\(x:5=y:2=\dfrac{x}{5}=\dfrac{y}{2};x-y=2\)

Áp dụng tcdtsbn , ta có:

\(\dfrac{x}{5}=\dfrac{y}{2}=\dfrac{x-y}{5-2}=\dfrac{30}{3}=10\)

\(\Rightarrow\left\{{}\begin{matrix}x=50\\y=20\end{matrix}\right.\)

d, Ta có: 

\(\dfrac{x}{2}=\dfrac{y}{5}=\dfrac{2x}{2.2}=\dfrac{y}{5}=\dfrac{2x}{4}=\dfrac{y}{5}\)

Áp dụng tcdtsbn , ta có:

\(\dfrac{2x}{4}=\dfrac{y}{5}=\dfrac{2x-y}{4-5}=\dfrac{18}{-1}=-18\)

\(\Rightarrow\left\{{}\begin{matrix}x=-36\\y=-90\end{matrix}\right.\)