（120000-80000）×（1-25%）+15000
    8.92/99.3
    4.43%+（4.8%+4.66%+4.52%+5.65%-3.97%-3.75%-3.48%-4.43%）/4
    2.5*1.15/1.28+2.5*1.15*1.15/1.28^2+2.5*1.15*1.15*1.02/26%/1.28^2
    2.5*1.15/1.28+2.5*1.15*1.15/1.28^2+2.5*1.15*1.15*1.02/13%/1.28^2
    5*1.1/1.24+5*1.1*1.1/1.24^2+5*1.1*1.1/24%/1.24^2
    5*1.1/1.24+5*1.1*1.1/1.24^2+5/24%/1.24^2
    5*1.1/1.24+5*1.1*1.1/1.24^2+5/24%
    2*1.18/1.08+2*1.18*1.15/1.08^2+2*1.18*1.15*1.1/8%/1.08^2
    sin17
    √7.2
    (6÷5)^2+(12÷5)^2
    1.05^40
    1.05^30
    1.05^50
    1.08^50
    1.08^15
    (833*（1+0.18+0.466+0.413+0.2）+311)*(0.21+0.79*2.567)*(1+0.466+0.8+0.5)*0.4
    (931*（1+0.18+0.466+0.2+0.2）+311)*(0.21+0.79*3.229)*(1+0.466+0.4+0.5)*0.4
    (833*（1+0.18+0.466+0.413）+311)*(0.21+0.79*3.17)*(1+0.466+0.8+0.5)

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