3.09^(8)*2.718^(-3.09)/40320
    3.09^(7)*2.718^(-3.09)/5040
    3.09^(6)*2.718^(-3.09)/720
    3.09^(5)*2.718^(-3.09)/120
    3.09^(4)*2.718^(-3.09)/24
    3.09^(3)*2.718^(-3.09)/6
    3.09^(2)*2.718^(-3.09)/2
    3.09^(1)*2.718^(-3.09)/1
    3.09^(0)*2.718^(-3.09)/1
    3.09^(1)*2.718^(-3.19)/1
    8x-3*9＝37
    3.09^(0)*2.718^(-3.19)/1
    x^4-33*x^2-100=0
    x^(2)-11x＝-36
    (4x+5)除以60%=12
    4.753^0*2.718^(-4.753)
    0.020179*x^8-0.00029648*x=0.004
    3x^(2)-6x=0
    2x+15=21
    7/2:0.5x=1.5:8/5

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