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    39/sina=53/sin(180/12-a)
    39/sina=53/sin(180/16-a)
    0.393*cos(25.8)*9.81-sin(25.8)*x^2/157=sin(25.8)*9.81+cos(25.8)*x^2/157
    a^2-√11a+1=0
    0.6*(1+g)/11.28+g=11%
    2.61= -7E-11x4 + 1E-07x3 - 6E-05x2 + 0.0129x + 0.0126
    3/x+1/3x=5/6
    x^5-3x+2=0
    x^2+6x+35=0
    a^2+100+10a=0
    12x+35×16
    x/6=35
    7x-8<9x
    2x+400-4x=350
    2x+400-4x
    (8/x)-2x=0
    (5.8+100)/(1+x)=102.33
    (5.8/x)*[1-1/(1+x)^10]+100/(1+x)^10=102.33
    x*0.88+242*0.12=205
    x*0.88+225*0.12=250 x*0.88+230*0.12=252 x*0.88+(242*0.12)=205

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