x/3100+2x/2600+4x/2650+0.57x/1000+0.01=1
    4（1+9x）^2+(6x+1)^2+3x+10=0
    （3100/1+2600/2+4/2650+0.57/1000）*x+0.01=1
    4（1+3x）^2+(2x+1)^2+x+10=0
    （x+1）^(2)-3＝0
    2x^(2)-8x＝0
    1938707/533975000*x=0.99
    4（1-6x）^2+(x-1)^2-5x+10=0
    7754828/533975000*x=0.99
    4（1-72x）^2+(12x-1)^2-60x+10=0
    1938707/533975000=0.99x
    750/p-200=800+150p
    (127/56)x+143.2=10(127/56)x
    x^3-3x+2 = 0
    x^3-x+2=0
    x/3.3=(1-0.3/2.613)^2
    2x=(340*340-x*x)*2043/(2040*340)
    0.00396X^2-1.069x+0.3=0
    x^2-x^3=2/45
    6.8/1.414 = 7E-08x4 - 1E-05x3 - 0.0005x2 + 0.1777x - 0.5735

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