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@ -29,7 +29,7 @@
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解: 设鸡有$x$只, 兔有$y$只,则:
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$ \begin{cases}x &+ &y &= 35 \newline 2x &+ &4y &= 94 \end{cases} $
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$ \begin{cases} x &+ &y &= 35 \newline 2x &+ &4y &= 94 \end{cases} $
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$ x = 35-y $
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