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這方程式解出來為X=-25,是個負數,想要聯系生活實際,編寫一道應用題,關鍵在於x-5這個公式怎麼編,如果說是少的話,其實x-5的絕對值反而比x大了,如果說是多了,那麼就要變成加號了.可以考慮向量,公式可變換為75/-x=90/5-x…
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