0.25×8.4用简便方法计算,

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0.25×8.4用简便方法计算,0.25×8.4用简便方法计算,0.25×8.4用简便方法计算,0.25×8.4=0.25x4x21.=1x2.1=2.1

0.25×8.4用简便方法计算,
0.25×8.4用简便方法计算,

0.25×8.4用简便方法计算,
0.25×8.4
=0.25x4x21.
=1x2.1
=2.1