x²+0.7x+0.15＝0
    e^（-1/x）*（1/x）=0.98
    x＾2-x-1=0
    1/√x
    20+(1+0.15*(x/2000)^4)=19(1+5.15*((2000-x)/2000)^4)
    20+(1+0.15*(x/2000)^4)=19(1+3.15*((2000-x)/2000)^4)
    20+(1+0.15*(x/2000)^4)=19(1+2.15*((2000-x)/2000)^4)
    20+(1+0.15*(x/2000)^4)=19(1+1.15*((2000-x)/2000)^4)
    20+(1+0.15*(x/2000)^4)=19(1+0.15*((2000-x)/2000)^4)
    20+(1+0.15*(x/2000)^4)=189(1+0.15*((2000-x)/2000)^4)
    20+(1+0.15*(x/2000)^4)=18+(1+0.15*((2000-x)/2000)^4)
    20+(1+3.15*(x/2000)^4)=22+(1+3.15*((2000-x)/2000)^4)
    20+(1+3.15*(x/2000)^4)=22+(1+1.15*((2000-x)/2000)^4)
    20+(1+3.15*(x/2000)^4)=22+(1+5.15*((2000-x)/2000)^4)
    20+(1+3.15*(x/2000)^4)=23+(1+5.15*((2000-x)/2000)^4)
    20+(1+3.15*(x/2000)^4)=23+(1+15.15*((2000-x)/2000)^4)
    20+(1+3.15*(x/2000)^4)=23+(1+20.15*((2000-x)/2000)^4)
    20+(1+3.15*(x/2000)^4)=23+(1+7.15*((2000-x)/2000)^4)
    20+(1+3.15*(x/2000)^4)=23+(1+4.15*((2000-x)/2000)^4)
    20+(1+3.15*(x/2000)^4)=23+(1+8.15*((2000-x)/2000)^4)

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