20-40%x=4
    20-40%x=4
    20-40%x=4
    20-40%x=4
    20-40%x=4
    20-40%x=4
    0.43*x^3=11.33*(x^3-(x-1)^3)+2.85*x^2
    x+7-xx=6
    300+(x-300)×85％＝（x-200）×90％+200
    x^（1/（x-1/x））=e^2
    x^2(0.01x^2+1)(0.000001x^2+1)=1000000
    0.01x^4+x^2-1000000=0
    1379086= T*(48.83*log(T) - 0.0397675*T + 1352970.0/T + 0.0000038365*T^2) -179.1045*T
    2x+4／1x=4
    4.1625=（30.56*0.847*（x+0.1））/（1+0.847（x+0.1））*（100-1.4-8.28）/100*1/(1+0.31*1.4)+（2.26（x+0.1））/（1.3*0.101325）
    e^x/x
    x+5.5x+x+0.5x+x=16
    15584487000=14.3*2000x(2905-0.5x)
    x^2(x^2+1)(0.16x^2+1)=25
    1/60×20+（1/60+1/90）x=1

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