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1m^2=10000[cm^2] ←覚えなくてよい。計算でわかりますよね
            分からなければ質問してください

1m^2:10000[cm^2]=x[m^2]:200[cm^2]
10000x=200
        x=0.0200
よって、200cm^2=0.0200[m^2]

みみみ

丁寧な回答ありがとうございます!!

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