(10^4.1)*(x^2)+(10^3)*x-1=0
    10^4.1x^2+10^3x-1=0
    (10^4.1)x^2+(10^3)x-1=0
    x^2+(10^(-1.1))x-10^(-4.1)=0
    x^3-x-1
    x^2-32x+320=0
    1/10x+10=(x+10)*2/11
    （18000+8600X）÷2=66000+8600X-2417*10
    （180000+8600X）÷2=66000+8600X-2417X
    （18000+8600X）÷2=66000+8600X-2417X
    23.2%=105%+r+105%*r
    x^2-4x+11=0
    x+0.08x+(x+0.08)*0.03=8100
    (4x+1)(3x+1)(2x+1)(x+1)=3x^4
    a^2-4a+2=0
    12x^4+4x^3-41x^2+4x+12=0
    (110500-x)/120000=0.1
    x+x²-600＝0
    1+log(x)+(500000-500000*log(x))/(x*x)
    n^2-n=240

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