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450平方分米=45平方米嗎 不是 450平方分米=4.5平方米 進率是100 我是老師謝謝採納
1米=10分米1平方米=100平方分米4平方米=400平方分米
1平方米=100平方分米 0.3平方米=30平方分米
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