（100000）/e-999
    （100000）/e999
    （1000000000）/e99999999
    1/πarctan1
    1/πarctanπ/4
    √222×222
    222×222
    46875*46875
    777*780
    91827/179
    5*53*937*37571
    129449+1
    99*732
    9551*22103561
    5*16553
    4356*19
    151*163
    (-2)^2+6/(-3)-sqrt(9)+(-0.1)^0 x^2-x≤2 x^3-2*x=1 x^ln(x)=4 x+2≥2*x 1/x≤1
    3+50:4*(-1/5)-1
    3+50:4*(1/5)-1

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