-4x^2+146x-1332=0
    24*24*3
    25400/(9.79+254)
    25400/(10.75+254)
    25400/(12.7+254)
    340/38.82*25=
    174*(1+25%)*(1+25%)*(1+25%)
    174+12
    89x一43X＝9．2
    s^3+5s^2+8s+3=0
    -arctan2+arctan20
    arctan2+arctan20
    arctan2-arctan20
    lnx=7.02
    12x^2-10x+1＝0
    12x^2-10x+5＝0
    arctan(2*-35.2)+arctan（8*-35.2)
    arctan(2*-35.2)+arctan（8*35.2)
    arctan0.84+arctan3.36
    （x+2）^6

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