0.0002*X*X+0.0005*X-0.000007=0
    x^2+3 = 2√3x
    x^2+3=2√3x
    ｛5（x+52.8）-3.9343｝
    −0.2571x^2+0.3908x+1.8145=0
    0.0001*X*X+0.0005*X-0.000007=0
    2x^(2)-46x+44=0
    0.0001*X*X+0.0006*X-0.00001=0
    (x*6*0.0001+0.668)*0.023*((2*0.8*100000/(0.415-0.05*x))^0.8)*((2.55-0.034*x)^0.3)=8000/x
    0.0001*X*X+0.0006*X-0.00003=0
    0.0001*X*X+0.0006*X+0.000001=0
    x=x^3
    0.2919x^2−2.5722x+4.5196=0
    3/4＋x=3/43
    23x^(2)-50x+25=0
    17a^2+28a-12=0
    x÷14/15=1/7
    x^2+3x+sqrt(x^2+3x)=6
    1*（1+x）^20=100
    （x+1)/2-(2x+1)/3=1/6

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