問題文全文(内容文)：
次の計算をしよう.

1.$\boxed{1}$
$\begin{eqnarray}
\left\{
\begin{array}{l}
x-2y=5\\
3x+5y=4
\end{array}
\right.
\end{eqnarray}$

$\boxed{2}$
$\begin{eqnarray}
\left\{
\begin{array}{l}
3x+y=12\\
x-y=8
\end{array}
\right.
\end{eqnarray}$

$\boxed{3}$
$\begin{eqnarray}
\left\{
\begin{array}{l}
5x+2y=-1\\
-3x+y=5
\end{array}
\right.
\end{eqnarray}$

$\boxed{4}$
$\begin{eqnarray}
\left\{
\begin{array}{l}
2x-3y=5 \\
x-2y=4
\end{array}
\right.
\end{eqnarray}$

$\boxed{5}$
$\begin{eqnarray}
\left\{
\begin{array}{l}
4x-9y=7 \\
5x-6y=7
\end{array}
\right.
\end{eqnarray}$

$\boxed{6}$
$\begin{eqnarray}
\left\{
\begin{array}{l}
2x-y=6\\
4x-3y=17
\end{array}
\right.
\end{eqnarray}$

問題文全文(内容文)：
次の計算をしよう.

1①$2x^2-4x-(5x^2-3x+2)$

②$3(2x-y)-5(x-2y)$

③$\dfrac{3x-y}{2}-\dfrac{x-2y}{3}$

④$\dfrac{5}{18}xy^2\div \left(-\dfrac{10}{3}xy\right)$

2.$8x-3y-3(x-4y)$

3.①$m=\dfrac{a+b}{2}$

②$V=\dfrac{1}{3}sh$

図は動画内参照

問題文全文(内容文)：
$1428 \times 1572 - 428 \times 572$ =

問題文全文(内容文)：
$x=?$ $\quad$ $y=?$
\begin{eqnarray}
\left\{
\begin{array}{l}
x^2 - 9y^2 + 4x -28 = 0 \\
x + 3y = 6
\end{array}
\right.
\end{eqnarray}

本郷高等学校

問題文全文(内容文)：
連立方程式を解け
$
\begin{eqnarray}
\left\{
\begin{array}{l}
x^2 - 2y = 8 \\
y^2 - 2x = 8
\end{array}
\right.
\end{eqnarray}
$
群馬大学