（1077.2-1120）/（1077.21162.25）
    50*0.75*10*0.9174+50*0.75*11*0.8417+50*0.75*12.1*0.7722
    -990229/2000
    6.88+6.94+7.007
    0.75*12.1*0.7722
    0.75*11*0.8417
    0.75*10*0.9174
    449885/1+2.5%
    449885/1+1/40*1/40
    2^10
    （3.14）/3*0.93
    √3*√13*（1/4）+√13*（1/2）-1
    43.16×0.6=
    41.5×0.6=
    9.5/5
    54.83×0.6=
    43.16×0.6=
    55.6×0.8×0.6=
    54.83×0.6=
    69.8×0.8×0.6=

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