10^lg1
     x*(x+2)*(x+4)*(x+6) = 3465
    45718138402－133327215780＝
    45718138402－13332721578＝
    828+x=（200+x）×3
    arctan0.5
    arctan5
    arctan2.5
    -x^2+4x-3=0
    93.24*e[0.00673*(100-93.24)]
    93.58*e[0.00673*(100-93.58)]
    90.9*e[0.00673*(100-90.9)]
    95.4*e[0.00673*(100-95.4)]
    94.97*e[0.00673*(100-94.97)]
    94.88*e[0.00673*(100-94.88)]
    94.01*e[0.00673*(100-94.01)]
    25400/(14.7+254)
    25400/(13.69+254)
    25400/(19.94+254)
    600/x-20-600/x=1.5

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