x^3-x^2-x+1=0
    8s^3+7s^2+s+2=0
    w*w*(0.1*w*0.1*w+1)*(0.5*0.5*w*w+1)=100
    90-arctanw-arctan0.5w=43
    arctanw+arctan0.5w=0.5π
    x ^2+49.54x-59244.83=0
    x=（1600*185^3*0.3）-（1400*65^3*0.3）+6.67*6810*994^2
    x=（1600*185^3*0.3）-（1400*65^3*0.3）+6.67*6810*994^2
    0.5*1600*x^2=6.667*6810*（1179-x）
    0.5*1600*x^2=6.667x6810*（1179-x）
    0.5*1600*x*x=6.667x6810*（1179-x）
    0.5*1600*x2=6.667*6810*（1179-x）
    (0.000394807x)^1.52+0.009330539*(0.000394807x)*(0.004231091x)+(0.004231091x)^1.02=1
    (0.000394807x)^1.52+0.009330539*(0.000394807x)*(0.004231091x)+(0.004231091x)^1.02=1
    (0.000394807x)^1.52+0.009330539*(0.000394807x)*(0.004231091x)+(0.004231091x)^1.02=1
    (0.000394807x)^1.52+0.009330539*(0.000394807x)*(0.004231091x)+(0.004231091x)^1.02=1
    (0.000394807x)^1.52+0.009330539*(0.000394807x)*(0.004231091x)+(0.004231091x)^1.02=1
    (0.000394807x)^1.52+0.009330539*(0.000394807x)*(0.004231091x)+(0.004231091x)^1.02=1
    (0.000394807x)^1.52+0.009330539*(0.000394807x)*(0.004231091x)+(0.004231091x)^1.02=1
    (0.000394807x)^1.52+0.009330539*(0.000394807x)*(0.004231091x)+(0.004231091x)^1.02=1

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