（26.807+x）×2.15＝53.614+72.221-x
    （26.807+x）×1.95＝53.614+72.221-x
    （26.807+x）×1.75＝53.614+72.221-x
    （26.807+x）×1.55＝53.614+72.221-x
    (s+2)^3=-8
    (s+2)^3=-1
    X²+34X=72
    （20+X）（14+X）=
    （20+X）（14+X）=
    X²+34X+280-72=0
    144+（a-2）^2＝a^2
    x^2-34x-300
    x^2-106x-300
    x^2-106x+300
    -x^2+208x+74000
    (x-1974)/x=13.05%
    -3x^4-36x^3-178x^2-420x-300
    -3x^4-36x^3-188x^2-420x-300
    -（1/30）xx+8/3x=8
    -20a^2+840a+5000=0

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