[(49917.8+a+843+8000)-35000-5901]*3% =445.79+a
    (x+sqrt(9-x^(2)))^(2)+(x+sqrt(8-x^(2)))^(2)=((sqrt(9-x^(2)))+(sqrt(8-x^(2))))
    (x+sqrt(9-x^(2)))^(2)+(x+sqrt(8-x^(2)))^(2)=((sqrt(9-x^(2)))+(sqrt(8-x^(2))))^(2)
    (x+sqrt(9-x^(2)))^(2)+(x+sqrt(8-x^(2)))^(2)=((sqrt(9-x^(2)))+(sqrt(8-x^(2))))^(2)
    n(n+1)/2=300
    n(n+1)/2=400
    n(n+1)/2=500
    n(n+1)/2=600
    n(n+1)/2=700
    n(n+1)/2=800
    n(n+1)/2=900
     2a ^2- a - 12 ≥ 0，
     2a 2- a - 12 ≥ 0，
    53+x=96
    59+x=97
    3^0.5sin2x+2sinx+4*3^0.5sinx
    e^（-3.1415*（x/（1-x^2）））=0.05
    e^（-3.1415*（x/（1-x^2）））=0.163
    arctan(0.2x)+arctan(x)=45
    x^2+16x-225=0

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