z^2-z-1=0
    (1+x+1/2x^2+1/6x^3+1/24x^4+1/120x^5+1/720x^6)*(3-x)-3=0
    (1+x+1/2x^2+1/6x^3+1/24x^4+1/120x^5)*(3-x)-3=0
    (1+x+1/2x^2+1/6x^3+1/24x^4)*(3-x)-3=0
    -1/2x^3+1/2x^2+3x=0
    1.1*10^7=x/((0.02-x)(1-2x)^2)
    1.12*10^7=x/((0.02-x)(1-2x)^2)
    1.17*10^7=x/((0.02-x)(1-2x)^2)
    10*x^2+2*x-1000=0
    2sqrt5*(16+sqrtx^)=8+4x
    2sqrt5*16+sqrtx^=8+4x
    11.81x^(3)+35.3424x^(2)-534.576x+309.44
    2（1+x）^(2)=2.42
    0.6(1+g)/12(1-6%)+g
    9.72*x^2+0.36*x-0.08=0
    x^2+0.1*x-0.02=0
    43=19*sin(40)*x+0.5*9.81*x^2
    3.8*sin(26)*x-0.5*9.81*x^2=-12
    8.52*sin(29)*x-0.5*9.81*x^2=-0.82
    x^2-5.6*cos(41/180π)x+5.59=0

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