(4d^2+90d+400)(1/(d+199/30))=d^3+30d^2+200d
    (4d^2+90d+400)(1/(d+199/3))=d^3+30d^2+200d
    3d^3+(60+398/15)d^2+797d+(40×199)/3=0
    3d^3+(60+398/15)d^2+200d=0
    3d^3+(60+398d^2/15)+200d=0
    x＾4=3x＾2+9-9x
    (x-2130)/2.9935 = x^(2/3)
    (x-2680)/2.1544=x^(2/3)
    x-2680=2.1544x^2/3
    50.76x²+1.5912x-0.0099=0
    1+5+2+56+5+65+5x=1
    3s^2+12s+8=0
    10%X=400*60%
    2.736-0.063x=0
    0.064x-1.36+0.36=0
    0.064x-.36+0.36=0
    500=x*(11-8)-100
    （2x-3）（3x-2）=10
    x-3（x+2）=14
    18t-3t²=10

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