1997*0.3+0.5*0.12/1999*0.5

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1997*0.3+0.5*0.12/1999*0.51997*0.3+0.5*0.12/1999*0.51997*0.3+0.5*0.12/1999*0.51997×0.3+0.5×0.12÷1995

1997*0.3+0.5*0.12/1999*0.5
1997*0.3+0.5*0.12/1999*0.5

1997*0.3+0.5*0.12/1999*0.5
1997×0.3+0.5×0.12÷1995×0.5
=1997×0.3+0.6÷1995×0.5
=1997×0.3+0.6×0.5÷1995
=1997×0.3+0.3÷1995
=0.3×(1997+1995分之1)
=0.3×(3984015分之3984015+3984015分之1997)
=0.3×3984015分之3986012
=0.3×1995分之1996
=6650分之1996
=3325分之988
绝对是我自己做的······