39X^2+400X-1600=0
    Arctan(0.271)
    Arctan(0.271)
    x-550-(1000*6%/12+1500*8%/12+x*6%/12）=50
    [(60927.81+a+10000)-35000]*10%-2520 =927.82+a
    [(60927.81+a+10000)-35000]*3% =927.82+a
    [(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

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