(x-507000)/x=0.15
    x^3+3x^2+3x+1-2-2-x-1-4-4x-4-x-1
    x^3+3x^2+3x+1-2-2-x-1-4-4x-4-x-1=
    x^3+3x^2+3x+1-2-2-x-1-4-4x-4-x-1=0
    x^3+3x^2+3x+1-2-2-x-1-4-4x-4-x-1=
    x^3+3x^2+3x+1-2-2-x-1-4-4x-4-x-1=
    45.28x^8+50x^7+50x^6=171.3226
    45.25*n^8+50*n^7+50*n^6=171.02
    45.25*n^9+50*n^8+50*n^7=177
    t^6=0.00000215319875589t^2+0.00000127750917177
    t^3=0.00543-0.03789t^2
    x=0.00543-0.03789x^(2/3)
    3x^2+5x-1000=0
    3x2+5x-1000=0
    x×2×0.75=72
    400^(2/3)+(10-400^2)^0.5 sin(kπ400)
    200+200（1+x）+200（1+x）²=1400
    x×2×0.75=69
    200+200（1-x）+200（1+x）²=1400
    x×2×0.75=36

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