4√（4-x²)
    x(1-x^16)/(1-x)=70.02684564
    x(1-x^16)/(1-x)=56.1160221
    x(1-x^16)/(1-x)=28.26363636
    x(1-x^16)/(1-x)=37.20091324
    80x+60x=480
    x(1-x^16)/(1-x)=29.21069182
    0.35%x+0.6%（4800-x）=24.8
    x(1-x^16)/(1-x)=30.06413994
    1.2（x-10）=0.8（x+5）
    x(1-x^16)/(1-x)=28.88658147
    5/4x=150
    5/4x=176
    x(1-x^16)/(1-x)=24.14540816
    x(1-x^16)/(1-x)=0.094508238
    3X-10／4X+10=1/6
    (x+1)/(x^3+2)-(x-2)/(x^3-9)=(x^2-x-2)/3
    60x^3+150x^2+x=200.1461
    x^3+120x^2+80x=194.1561
    x^3+20x^2+110x=127.9241

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