5/x-6/x=0.4
    -3*x^2+6*x-2=0
    1+25%x=6.25
    487.639+1.066x-x^2/22×(109.286+1.066)=0
    3^0.5/2/2
    y=0.1*(2.11-2)*(2.11-2)/2
    x=2.77-(0.1*(x-2)*(x-2)/2)*1000
    200x-500=150x+250
    223.04×16.01+565.32×11.01+4.82×6.01+687.23×3.28+398.45×0.59-0.002×16.92-1002.21×9.87-746.64×3.36-130.05×0.59=
    （40/x+8.5）/（50/x+6.8）=0.507/0.493
    223.04×8.75+565.32×3.75-0.002×9.66-788.41×3.5=
    0.365*a+0.00000854*a^3 = 7.3
    0.365*a+0.00000854*a^3=7300
    4.184*（298-x）=333.4*0.15+0.15*4.184*（x-273）
    1/2（2m+m+2）（-m+2）
    x/0.1*(1-1/1.1^6)=22487
    0.365*a+0.00000854*a^3=7.3
    x/0.1*(1-1/1.1^6)=37582
    x/0.1*(1-1/1.1^3)=37582
    x/0.1*(1-1/1.1^3)=22487

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