6.4*0.25*12.5用简便方法怎么算

日期:2010-09-19 17:18:40 人气:1

6.4*0.25*12.5用简便方法怎么算

6.4*0.25*12.5 =6.4÷4×12.5 =1.6×10+1.6×5/2 =16+4 =20
    A+
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