1.0×{[1.3×0.785+1.4×0.7×3.0]×0.4+1.3×0.142}
    x*x*x*x*x*x+401*25*x*x*x*x+250000*x*x-100000000=0
    x^(2)+3x-1=0
    a=38.9(cosa)^3+3.82
    x*x*x*x*x*x+401*25*x*x*x*x+250000*x*x-10000000=0
    1.0×1.3×1.5×0.4
    x^(2)+3x=1
    x+8=
    a=38.9cosa+3.82
    n=2
    x=1.72*(cosx)^3+1.45
    x=6.54*(cosx)^3+1.45
    0.019408523/0.322090377=1-1/(1+(65107.92057/17)*e(-0.322090377)x)
    x*59.5-0.45*x*x/12=69.56
    -x=6.54*(cosx)^3+1.45
    x+2=3
    6x^2-30x+75=0
    x/(x+8)=0.25
    6x2-30x+75=0
    0.597*cos(-x)^3+x/57.3 = -1.29

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