2*(25*18.75-1/4*3.14*9.82^2)*(1000/1.75)
    3.14*9.82(1.75-0.15)*(1000/1.75)
    3.14*9.83(1.75-0.15)*(1000/1.75)
    2043*(50-47.56)^-0.25
    (50-x)^0.75=0.2585(x-40)
    (50-x)^0.75
    922^0.625
    16.579^-0.375
    （1/1/2+√5）+（1/1/2-√5）
    [(1+√(1-3.14159cinos2))/(2cinos2)
    21^2+480
    (x+3)(x+5)=e
    ln(x+3)+ln(x+5)=1
    70%*130X*6.4%
    54/60
    58/60
    1010101010101010101010101010101/3
    90/40
    258*258
    X/45=75/100

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