101.41x^2+86.501x-5.7381=459.4986
    101.41x^2+86.501x-5.7381=560.6638
    101.41x^2+86.501x-5.7381=404.4424
    101.41x^2+86.501x-5.7381=283.9125
    101.41x^2+86.501x-5.7381=474.9528
    101.41x^2+86.501x-5.7381=124.1655
    101.41x^2+86.501x-5.7381=86.11228
    101.41x^2+86.501x-5.7381=130.3616
    101.41x^2+86.501x-5.7381=243.4341
    101.41x^2+86.501x-5.7381=177.0465
    (x-6)^3+(x-7)^2=3
    1/m+1/(m+1)+1/(m+2)+1/(m+3)=19/20
    (x+1)*(x-1)=-2
    4/(x^2-4)=1/(x-2)
    -8（x-1）²+5=0
    -8（x-1）+5=0
    x+2=3
    k^3+3k-3k^2=63/64
    x-2ln(1+x)＝0
    x+2ln(1+x)＝0

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