3^x = x^1
     3^x = x^0
     3^x = x^99
     4^x = x^10
     3^x = x^10
    (0.1*x-0.2)/0.02-(x+1)/0.5=3
     4^x = x^9
    3^x=x^9
    A1/20+A1/30+A1/42=3
    8y²-4y-2=0
    4y²-2y-1=0
    6.25=x*x+0.49
    -2x²+100x-1200=0
    -2x²+100x-400=0
    x/(x+49)=0.1
    t^2-（-（（1/2）t））^2=4t-4
    12*x^2-18*x-39=0
    24531×24531a+11475×11475×(16944-a)=252333225×16944+16944a(16944-a)
    24531×24531a+11475×11475(16944-a)=256803264×16944+16944a(16944-a)
    4x²+2[x(100-2x)]+2[x(50-2x)]=1400

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