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按整式乘法進行計算 要點就是 得數的小數位數等於兩個乘數小數位數之和. 比如2.31*3.42 結果必然為4位小數 如最後位為0,0也必須數一下 比如 2.5*4,如果按一位小數寫為10.0,小數點后的0在計算佔位后省去
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