x/(sqrt(1+3)*sqrt(1+4*3)*sqrt(1+0.75))=1
    x^2-11.9x+35.3=0
    X(6-X)=5
    （30-Y)(72+3Y)=2160
    80（1+x）（1+x）=72
    3/4x^2+41/25x-4=0
    (58-x)/ln((90-x)/32)=46.3
    46.3*lnx-x=128.5
     1/(1+x²)
    12x²+10x-250＝0
    x-1824=3.5539x^(2/3)
    x-932=1.1363x^(2/3)
    720*（0.5a+400）÷560+50a÷60=1.5a+400
    x^2+x-600=0
    1981a+535*（7610-a）=7610*912
    -13/36x^2+23/4x-175/18=8
    √2x=1
    -13/36x^2+23/4x-175/18=8
    8096x^2-89100x+81000=0
    x-1/x

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