x/0.1*(1-1/1.1^2)=22487
    2√5＝（√5＋x）（2－√x^(2)-4）
    8xx+252x+117=0
    900+505.25x^2-56.25x^4-2.5x^6=0
    0.003x^(2)+29.856x-92271.555
    (138.5/a)+(468/a^3)=7.3
    9.06*cos(a)+102*cos(a)*(tan(a)-a*3.14159/180)=9.94
    0.003x^2+29.856x-92271.555
    7.3=(138.5/x)+(468/x/x/x)
    X^3+3*X^2+2*X+6=0
    x十0.2x=6
    x/(0.08083/12)*(1-1/(1+0.08083)^360)=203150
    900+56.25x^2-9x^4-0.45x^6=0
    x^3-2x^2-8x+4=0
    -1/4x^2-1/2x+2=1
    x:(52.2-x)=3:55
    x:(52.5-x)=3:55
    (25547-x)/(301185-x)=0.0386
    106.81*6.95+245.66*2.95-266.79*1.84-85.86*5.46
    x^(2)+40x+80=0

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