（32-2x）（20-x）=570
    3k^2-48^1/2k+4=0
    3k^2-（4*3^1/2）k+4=0
    3k^2-4*3^1/2k+4=0
    12x²-28x+15＝0
    2√2(x-x^3)=x^4+1
    2√2(x-x^3)=x^4-1
    （x-60）/0.75=x
    e^(1/e)=1/(x^(1/x))
    x^(1/x)=1/(e^(1/e))
    2.5*(T-350)=-T+350*50/200
    0=1*8.314*ln（200/50）+1*7/2*8.314*ln(x/350)
    0=1*8.314*ln（200/50）+1*8.314*ln(x/350)
    17x-17x^3=6x^4+6
    5100*(x+61x/71)+7100x=5
    3x-3x^3=x^4+1
    2x-2x^3=x^4+1
    x-x^3=x^4+1
    logx3=1/3
    X/(X+30)=0.4

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