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1/200000=1/2*1/100000=0.5*10^(-5)=5*10^(-6) 分數要化成小數,注意後面是乘以10的負多少次方, 還有就是科學計數法前面的數必須在1~10之間 請點擊下面的【選為滿意回答】按鈕,
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