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4.解方程组$\begin{cases}2026x - 2027y = 2025&①,\\2025x - 2024y = 2026&②.\end{cases}$
答案
$\begin{cases} x=2, \\ y=1 \end{cases}$
5.解方程组：
(1)$\begin{cases} \dfrac{x}{2} = \dfrac{y}{3} \ \ ①, \\ 4x - 3y = 3 \ \ ②; \end{cases}$
(2)$\begin{cases} x:y = 3:2 \ \ ①, \\ y:z \mathrm{$
$}:1 \ \ ②, \\ x + y + z = 60 \ \ ③. \end{cases}$
(1)$\begin{cases} \dfrac{x}{2} = \dfrac{y}{3} \ \ ①, \\ 4x - 3y = 3 \ \ ②; \end{cases}$
(2)$\begin{cases} x:y = 3:2 \ \ ①, \\ y:z \mathrm{$
$}:1 \ \ ②, \\ x + y + z = 60 \ \ ③. \end{cases}$答案
(1)$\begin{cases} x=-6, \\ y=-9 \end{cases}$
(2)$\begin{cases} x=30, \\ y=20, \\ z=10 \end{cases}$
(2)$\begin{cases} x=30, \\ y=20, \\ z=10 \end{cases}$
6.解方程组$\begin{cases} 3(x + y) - 4(x - y) = 8, \\ \dfrac{x + y}{3} + \dfrac{x - y}{12} = 3. \end{cases}$
答案
$\begin{cases} x=6, \\ y=2 \end{cases}$
