更新
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@ -28,10 +28,7 @@
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解: 设鸡有$x$只, 兔有$y$只,则:
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$$ \begin{cases}
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x+y &= 35\\
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2x+4y &= 94
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\end{cases} $$
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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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