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    1-((-1)*(-1))+((-1)*(-1)*(-1))-((-1)*(-1)*(-1)*(-1))
    7.5*15.6
    165.1-149.5
    0.5π*1.5(80*14.1+90*7)+0.25π*1.5*1.5*(210.7+2.45(117+9.3*7)/(15.6+7)*(12.6+7))
    4685.964+10.07*7^2
    4685.964+10.07*6.83^2
    4685.964+10.07*18.18^2
    4685.964-10.07*18.18^2
    4685.964-10.07*6.83^2
    0.5π*1.5(80*14.1+90*18.18)+0.25π*1.5*1.5*(210.7+2.45(117+9.3*18.18)/(15.6+18.18)*(12.6+18.18))
    0.5π*1.5(80*14.1+90*6.83)+0.25π*1.5*1.5*(210.7+2.45(117+9.3*6.83)/(15.6+6.83)*(12.6+6.83))
    5125.964+10.07*13.39*13.39
    5125.964+10.07*9.27*9.27
    512.964+10.07*9.27*9.27
    0.5π*1.5(80*14.1+80*13.39)+0.25π*1.5*1.5*(210.7+2.45(117+9.3*13.39)/(15.6+13.39)*(12.6+13.39))
    0.5π*1.5(80*14.1+80*9.27)+0.25π*1.5*1.5*(210.7+2.45(117+9.3*9.27)/(15.6+9.27)*(12.6+9.27))
    3.14*1.5^2*(15-9.3)/4
    3.14*1.5^2*(15-7.5)*(163.60-149.5)/4
    3.14*1.5^2*(15-7.5)*(163.60-149.5)
    3.14*1.5^2*15/4

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