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    1/5(x-9)=1/2x-9
    -x^2+29x+912
    x+5=6
    0=70%-37%-(1+10%)/10%×10%×(1-X)
    60%-20%-【(1+x)/x】*5%*(1-30%)=0
    x^2-3x-2
    0=70%-37%-(1+10%)/10%×10%×(1-X)
    X^4-X^3-1
    1+t^3/1-t^3
    2258.4*x=222.08-221.28/e(-1.6*x)
    (243.61-x×10)×0.311-2×4.7×√0.311=98.92
    (243.61-x×10)×0.311-2×4.7×√0.311=98.2
    x^2+2*cos(x-0.9549)+2*x*sin(x-0.9549)=2.781625
    arcthx
    3.82=1.42*(1+120/1.42*0.126)^x
    3.82=1.42*(1+20/1.42*0.126)^x
    2.81=1.74*(1+135/1.74*0.126)^x
    2.997=1.75*(1+151/1.75*0.126)^x
    2.879=1.75*(1+151/1.75*0.126)^x
    (243.61-x)×0.311-2×4.7×(√0.311)+x=98.2

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