用简便方法计算9.81*0.1+0.5*98.1+0.049*981

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用简便方法计算9.81*0.1+0.5*98.1+0.049*981
用简便方法计算9.81*0.1+0.5*98.1+0.049*981

用简便方法计算9.81*0.1+0.5*98.1+0.049*981
9.81*0.1+0.5*98.1+0.049*981
=9.81*0.1+9.81*5+9.81*4.9
=9.81*(0.1+4.9+5)
=9.81*10
=98.1