根据题意有$\left \{ {{\begin{array}{ll} {\dfrac {500} {x}+1=\dfrac {500} {y}} \\\ {\dfrac {300} {y}-\dfrac {40} {60}=\dfrac {250} {x}} \end{array}}} \right .$
(此题为填空题,列出方程式即可)
根据题意有$\left \{ {{\begin{array}{ll} {\dfrac {500} {x}+1=\dfrac {500} {y}} \\\ {\dfrac {300} {y}-\dfrac {40} {60}=\dfrac {250} {x}} \end{array}}} \right .$
(此题为填空题,列出方程式即可)
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