ex/(ex+1)
    4.29t²－4.88t－2.74
    -5+1*x+10*x^2+12*x^3=2+3*x+4*x^2+5*x^3
    x-x/1.06*0.06-x/1.06*0.1=1856.5
    x-x/1.06*0.06-x*0.1=1856.5
    （8906.5+43.75+15+X）*(3.5%)=4X
    （8906.5+43.75+15+X）*(3.1%)=4X
    （8906.5+43.75+15+X）*(3.5%)=4X
    x-x/1.06*0.06-x/1.06*0.1=13176.51
    （8941.28+15+X）*3.5%=4X
    （8941.28+15+X）*3.1%=4X
    x^3-25x^2-3250x
    x*1.3=2.45
    0.493/(50/Q+6.8)=0.507/(40/Q+8. 5)
    x²+x=68
    （16x）^2+（9x）^2=68.58^2
    x^3-25x^2-3250x
    1=0.6*x*sqrt（19.62*2-9.81*x）
    1=0.6*x*sqrt（19.62*2.5-9.81*x）
    1=0.6*x*sqrt（19.62*3-9.81*x）

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