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    (0.5+x)x/(0.01-x)=1.8*10^(-5)
    (0.5+x)x/(0.01-x)=1.8*10^-5
    (0.25+x)x/(0.01-x)=1.8*10^-5
    1.8=0.1*x*x/(1-x)
    1.6x2-5.2x+2.6=0
    116.4=20.1x+5.1
    21.65*(1+9/r^2)-4.35*(1+243/r^4)=3*[21.65*(1-9/r^2)+4.35*(1+243/r^4-36/r^2)]+0.08√3
    arcsinx/√x^2-2x+2
    21.65*(1+9/r^2)+4.35*(1+243/r^4)=3*[21.65*(1-9/r^2)-4.35*(1+243/r^4-36/r^2)]+0.08√3
    2r²=1
    2r²=1
    x²+0.00106x-0.0000689
    x²+0.00706x-0.0000689
    sin(x)/x=0.999078
    sin(x)/x=0.999819
    x^3+2x=4
    0.05+e^(-t/1.38)/1.62=e^(-t/3.62)/0.62
    ㏑(1+2.5t)=2.5t-3
    X-X/1.01*0.01-(X-X/1.01*0.01)*0.043=358145
    14.3*250*x(460-x/2)-125000000=0

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