tanx/x=0
    tanx/x=-1
    x=2-x^2/2
    x=2-x2/2
    tanx/x=1
    350=4(10000/x)+2(7800/(x+22.4))
    2*0.06*x-3x^2-x^3/0.06+(0.06^2*x^2-2*0.06*x)/(0.06^2+2*0.06*x+x^2)=84/(3.14*10^8)
    6x/80=38400/(x^2)
    x/6400=38400/x
    x+ln(x)=-1
    2/3/c＝5/6
    x1
    1.6x＝0.32
    x=2
    x-x/1.09*3% =767837.49
    x-x/1.09*3% =5893.21
    x-x/1.09*3%=965611.37
    x-x/1.09*3%=972.48
    5x+9=19
    8.39x+5x^2＝3.53

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