(e^x-x-1)/(x^2)=0.5
    0.45/(2.25-x)+0.03/(1-x)+0.033/(0.33-x)+0.084/(0.21-x)=0
    x^3-29/100x+11/200
    3600/x-3200/1.5x=10
    3600/x-1.5 3200/x=10
    X/111-2/44.7-2/45-(76-X)/500=0.115
    1200/x—600/1.5x=1
    π*(D^2-74^2)=1000000*4*0.042
    x^2+7x＝60
    arccoa（0.3:0.371）
    arccoa（0.3:0.371）
    x-13/3=1/3*x^2-1/3*x-4
    X/126-3/44.7-2/45-(90-X)/500=0.238
    5.5x-21sqrtx-126.5
    5.5x
    lnx-1/2x=0
    x(x+1)=6.3/(10^36)
    x*(1-x) = 6.3*10^(-36)
    x=2
    x*(1-x)=6.3*10^(-36)

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