e^x=1/x
    e^x=lnx
    x=-lnx
    x=lnx
    x^x=3^81
    ln(cosx)
    15=10lg(r/5)+0.3(r-5)
    x*x-3*x+2=0
    lnx+x-1/x=0
    x*x-8*x+15=0
    (0.95*P-11)*50000-67500=103550
    (0.95*P-11)*50000-67500=103550
    (0.95*P-11)*50000-67500=103550
    (0.95*P-11)*50000-67500=103550
    (0.95*P-11)*50000-67500=133525
    x*x+x=0
    a*a-3=2*a
    （e∧2）÷（1-a）＝4.05*10∧-10
    x×x+1.4x×1.4x＝49
    0.292=(0+20676.84+x+((0+20676.84+x)/(0+265000)*(-665000))+61944.65)/(0+265000+(-665000)+287602)

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