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3.78x2.9 37.8x0.71简便方法

3.78x2.9 +37.8x0.71简便方法 3.78x2.9 +37.8x0.71 =3.78x2.9+3.78x7.1 =3.78x(2.9+7.1) =3.78x10 =37.8

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