(1/40+1/60)*27-x/40=1
    2.4X=12/13
    -4x^2-24-75
    a^2+11a-77=0
    x^3-766.67x^2+152288.89x-6140777.78
    x^6-766.67x^4+152288.89x^2-6140777.78
    （x-1）^2(x-3)^2
    x²-cosx
    350x=2880+50x
    ex=x^2
    2^x=x-2
    csc(x)=arctan(x)
    -20-4x+20=100-6x
    -20-4x-20=100-6x
    ln（1+x）
    xlnx=-24.62×4885
    xlnx=24.62×4885
    lnp=24.62-8.314×4885/0.015p
    lnp=24.62-8.314×4885/15p
    lnt=1＋1/t

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