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
    x+0.03x=1421367.41
    x+0.09x=1421367.41
    19=x+x^2+x^3+21x^4
    4x^2+24 x- 108=0
    X=2X+18
    -2X-4=12
    0.0002*(0.01 - a) = a^2
    x(sinx)∧2

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