20.5*3.45+(3.67-2.39)简便计算 要求简便计算,
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20.5*3.45+(3.67-2.39)简便计算 要求简便计算,
20.5*3.45+(3.67-2.39)简便计算 要求简便计算,
20.5*3.45+(3.67-2.39)简便计算 要求简便计算,
20.5*3.45+(3.67-2.39)
=(20+0.5)*3.45+1.28
=20*3.45+3.45/2+1.28
=69+1.725+1.28
=72.005
20.5*3.45+(3.67-2.39)简便计算
20.5*3.45+(3.67-2.39)简便计算 要求简便计算,
20.5乘3.45加65.5乘2.05(简便计算)
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化成分数3.45=
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20.5用分数表示