1997*0.3+0.5*0.12/1999*0.5

1个回答

  • 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······