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a*b=c,c/a=b,c/b=a 你說的是:一個因數不變,另一個因數擴大幾倍,積就擴大幾倍.這是乘法的基本性質,就是一個因數擴大幾倍,另一個因數縮小相同的倍數,積的大小不變.利用這個性質,我們可知道:1)一個因數擴大幾倍(2倍...
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