x^3-3x^2-9x-5
    (2.4/a-0.2a-0.8)^2+(4.8/a-0.4a-1.6)^2=7.2
    (2.4a-0.2a-0.8)^2+(4.8a-0.4a-1.6)^2=7.2
    4x^3+2x-1=0
    X^2-4X-4=0
    560(1-x)²=315
    √x/5-√(x-1)/5=0.2
    600000 = 30000*x*490.874*sqrt(1-1/(1+x-0.0003395)^2)*20
    220x^2-596x+121=0
    600000 = 30000*x*490.874*sqrt(1-1/(1+x-0.0003395)^2)*16
    0=t^2-48/27×t- 85/27
    （40-x)(20+2x)=1200
    （10+x）（600-x）＝10000
    600000=30000*x*490.874*sqrt(1-1/(1+x-0.000679)^2)*16
    3a×a+7a=8
    3a×a+7a
    a+2=5
    x(1/340-1/1500)＝0.5
    （16-3X）（160+3X）=3640
    60x-20x^2=-5000

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