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今日の計算 答え
【解説】1999×25=(2000−1)×25=2000×25−1×25=50000−25=49975
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Copyright © ITmedia, Inc. All Rights Reserved.
【解説】1999×25=(2000−1)×25=2000×25−1×25=50000−25=49975
Copyright © ITmedia, Inc. All Rights Reserved.