e^(-0.5)/0.25+e^(-0.5)*(-1/2)*0.25^(-0.5)*ln0.25
    e^(-0.5)+e^(-0.5)*(-1/2)*0.25^(-0.5)*ln0.25
    0.25^(1/2)
    o.25^(1/2)
    e^(-1/2)*4-1/2*e/4*ln0.25
    e^(-0.25^1/2)+e^(-0.25^1/2)*(-1/2)*0.25^(-1/2)*ln0.25
    50=100*x/(100+x）
    (2a^4-(1158/100)a^2+2)/(a^3+(772/100)a^2-a)
    (2a^4-11.58a^2+2)/(a^3+7.72a^2-a)
    (2a^4-3*3.86*a^2+2)/(a^3+2*3.86*a^2-a)
    x+x/1.13*0.13=11235
    2（x-10）=4x
    x ^2-289=0
    x ^2-9x-136=0
    x ^2+12x-253=0
    4x ^2+8x-7=0
    8x ^2+2x-7=0
    8x ^2x-7=0
    6x-15=-4x
    3x^2+5x-1=0

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