e^2-（x-1）^2=0
    8.25*x*x-15.5*x-121
    4000/x-6000/3x=1000
    4t×t-80t+400＝225
    x+1/tan(x)=1.59
    x+1/tanx=1.5878729752720
    X^2-49x+180=0
    X^2-49x+180=2
    190t=180（t+3）
    [q*(q+1)*(q+2)][q*(q+1)(q+2)+1]=3660
    xxxxxxxxx+6xxxxxx+4xxxx+13xxx+7xx+2x=3660
    x^3+x^2-11/12*x-2/3＝0
    （X-X/1.13*0.13）/7.27=0.51
    （X-X/1.13*0.13）/7.27=0.433
    （X-X/1.13*0.13）/7.27=1.595
    （X-X/1.13*0.13）/7.27=0.318
    （X-X/1.13*0.13）/7.27=0.0728
    （X-X/1.13*0.13）/7.27=0.728
    x+1=2^（1-x）
    x+1=2^1-x

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