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因為一個因數擴大8倍,積也應擴大8倍;一個因數縮小8倍,積也應縮小8倍;一個因數擴大8倍,另一個因數縮小8倍,積相當於先擴大8倍,再縮小8倍,相抵消,還是等於原來的積,即57 花了好長時間寫了思考過程,要選我哦! 祝你學習天天向上!有不會的題可以來問我
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