173*0.1729
    173*0.2238
    12.08x^3+72.14x^2-146.6x-2363.66=0
    173*0.2173
    173*0.1406
    173*0.0455
    -42y^3-124y^2+480y=270
    3.09^0*2.718^(-3.09)/1
    0.0410089x-0.0007136x*x=0
    173*0.0456
    25x+15（45-x）=975
    3.09^(9)*2.718^(-3.09)/362880
    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

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