（X- 40）×【300+20×（60 -x）】=6080
    x+x^2+x^3+x^4+x^5=5.1835
    320989741x=999999999999999983
    432809599x=1999999999999999999
    127x=1
    7x=1
    1518x=1
    52x=1
    2x=588888
    (x/3)/2=2/x
    lgx=-0.4
    xx=-1
    20（1-x）+20（1-x）＾2=16.2
    1.25^x=x
    x=sqrt(5)*ln((1+sqrt(5))/2)
    x=1/ln((3+sqrt(5))/2)
    x=1/ln((1+sqrt(5))/2)
    x=1/(ln(1.2938)-ln(0.2938))
    2^x=sqrt(4-x^2)
    x^(sqrt(x))=5

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