3.5/1.56*1007*1.5*30*1.4+1007*1.5*0.3*30*1.4*1.55+3.5/1.56*1200*15*1.4+1200*0.3*15*1.4*1.55
    3.5/1.56*1007*1.5*30+1007*1.5*0.3*30
    100-50
    2^3
    1/2+1/π*arctan2-1/4
    1/2+1/π*arctan1-1/4
    1/2+1/π*arctan1-1/4
    1/2+1/π*arctan2-1/4
    1/2+1/π*arctan2-1/4
    1/2+1/π*arctan2+1/4
    1/2+1/π*arctan2+1/4
    1/2+1/π*arctan2
    28÷9×4.5－4.5－3×28÷9÷2－1.5×（28÷9－2）
    2e∧2
    64.66×0.6=
    48.16×0.6=
    (1045*1.12+1045*2.5+1045+1200)*0.5/3.5+(1045*1.12+1045*2.5+1045+1200)/3.5+(1045*1.12+1045*2.5+1045+1200)*0.035*50/3.5
    (1045*1.12+1045*2.5+1045+1200)*0.5/3.5+(1045*1.12+1045*2.5+1045+1200)/3.5+(1045*1.12+1045*2.5+1045+1200)*0.035*50
    (1045*1.12+1045*2.5+1045+1200)*0.5/3.5+(1045*1.12+1045*2.5+1045+1200)/3.5
    -3^-3

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