0.45*(2.57/0.982)*922^0.65*(0.477393/0.28794)^-0.375*0.698^0.33
    3.14*(9.52-0.35)
    3.14*8.65
    5.404*2.9/17
    3*1.75*25/(1.6*15.18)
    1.75*25/(1.6*15.18)
    4.2*700000
    5.47*100000=880*0.5*（x-20）+4.2*1000*2.5*（x-20）
    3.14(9.52-2*0.035)*100
    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

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