sqrt(225-xx)+x=441
    (2783.346-x)/x*100%=1.29%
    （x^2-x+2）（x-1）^6
    （x^2-x+2）（x-1）^6
    （x^2-x+2）（x-1）^6
    （x^2-x+2）（x-1）^6
    sinx*cos200x
    x1/3+3x=6
    sinx=0.955
    cotx=0.5
    cotx=0.5
    cotx=0.5
    tanx= 0.373
    tanx=0.373
    y^2+2y-9998＝0
    x^3=16/50
    (1/x)+(1/(x+1))+(1/(x+5))+(1/(x+10))=0
    (x-22)/x=77%
    43*y^2-64*y-80=0
    1800-702.739÷（0.13+0.000198X）=X

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