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看你是要怎麼定義一個一元一次方程了.如果是說 4x/5+4=0 和4x/5=-4是一個方程的話 那麼就只有一個這樣的一元一次方程 如果認為上面兩個方程是不同的話,那麼這樣的一元一次方程就有無數多個.
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