（4∧x＋2）∧-1
    (x^3-x^2+2*x+1)/(1-x)^2=0
    x^5-4x^4-x^2-2=0
    209（x+5）=260x
    x-（0.096x）=273720
    X=(X+865707.25)*1.5%
    x/30+(35-x)/40=1
    x*e^(-x)=1/4
    (x/20)+(x/30)+(x/42)=3
    s^3+6s^2+8s+4=0
    X=(X+874141)*1.5%
    x²+x-1
    625÷(x+5)=500÷x
    3-（x+2)=5x(x+1)
    X（X+1）
    x^7=1
    （0.582-0.574）*1000+（0.583-0.574）*1000+（z-0.574）*1000+（0.576-0.574）*1200-0.4=20
    1x+x^2=462
    5x=4x-6
    x^2-15.8x+62.4=0

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