0.5*7.8+2.1简便方法

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0.5*7.8+2.1简便方法0.5*7.8+2.1简便方法0.5*7.8+2.1简便方法0.5*7.8+2.1=0.5*2*3.9+2.1=1*3.9+2.1=3.9+2.1=6

0.5*7.8+2.1简便方法
0.5*7.8+2.1简便方法

0.5*7.8+2.1简便方法
0.5*7.8+2.1
=0.5*2*3.9+2.1
=1*3.9+2.1
=3.9+2.1
=6