1997*0.3/1999*0.5+1.2/1999 简便运算

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1997*0.3/1999*0.5+1.2/1999简便运算1997*0.3/1999*0.5+1.2/1999简便运算1997*0.3/1999*0.5+1.2/1999简便运算1997*0.3/1

1997*0.3/1999*0.5+1.2/1999 简便运算
1997*0.3/1999*0.5+1.2/1999 简便运算

1997*0.3/1999*0.5+1.2/1999 简便运算
1997*0.3/1999*0.5+1.2/1999
=1997*0.6/1999+1.2/1999
=(1997*0.6+1.2)/1999
=(1997*0.6+0.6*2)/1999
=(0.6*(1997+2))/1999
=(0.6*1999)/1999
=0.6

1997×0.3/1999×0.5+1.2/1999=1997×0.3×2/1999×0.5×2+1.2/1999
=1997×0.6/1999+1.2/1999
=(1999-2)×0.6/1999+1.2/1999
=1999×0.6/1999-2×0.6/1999+1.2/1999
=0.6