Thực hiện phép tính

----- Nội dung ảnh -----
16) \( \sqrt{x - 5y} = 2\sqrt{5} \)
\( \sqrt{5x - 2y} = 7 \)

17) \( \sqrt{2x + y} = \sqrt{2} + 2 \)
\( 2\sqrt{2x - y} = 2\sqrt{2} - 2 \)

18) \( \frac{2\sqrt{3x - 2y}}{5} = \frac{5}{2} \)
\( \sqrt{3x + 2\sqrt{2}y} = 10 \)

19) \( 5x - y\sqrt{2} = 4\sqrt{2} \)
\( 2\sqrt{2} + y = 5 \)

20) \( 2(2x - 3) - (y + 2) = 4 \)
\( 3(2x - 3) - 2(y + 2) = -5 \)

21) \( \frac{3}{2x - y} - \frac{6}{x + y} = 1 \)
\( \frac{1}{2x - y} + \frac{y}{x + y} = 0 \)

22)
\[
\begin{array}{ccc}
2(x + 1) & 5(y - 1) & = 9 \\
x - y & x + y & \\
3(x + 1) & 5(y - 1) & = 21 \\
x - y & .x + y & = 11 \\
\end{array}
\]

23)
\[
\begin{array}{ccc}
5x + y & = 27 \\
x + 1 & y - 3 & \\
2x & 3y & = 4 \\
x + 1 & 2x - y + 1 & = 5 \\
\end{array}
\]

24)
\[
\begin{array}{ccc}
4 & 5 & \\
x + y - 1 & 2x - y + 3 & \frac{5}{3} \\
x + y + 1 & 2x - y + 3 & -7 \\
\end{array}
\]