7x-467.56-(7x*13%-112-14)*10%(7x-467.56)*25%=260
    7x-467.56-(7x*13%-112-14)*10%(7x-467.56)*25%=260
    18+9.1+53.8+（X-6.3）2.8+12.4X=23.5x/1.06/1.2
    7x-467.56-(7x*13%-112-14)*10%(7x-467.56)*25%=0
    7x-467.56-(7xx13%-112-14)x10%(7x-46756)x25%=0
    18+9.1+53.8+（X-6.3）2.8+12.4X=23.5x/1.06
    18+9.1+53.8+（X-18.9）2.8+12.4X=23.5x/1.06
    1*y-(1*y/1.13*0.13-1*50)*1.1-950=0
    416.74+0+12.50+0.01V+18.40+0.0002V+22.38+0.0005V+0.0529V=V
    arctan(0.5x)+arctan(0.15x) = 35
    arctan(0.5x)+arctan(0.15x)=90
    X²＋2x＝1/3
    sinx-2x=1.6-2π
    xln(x/3028)＝0.5259
    x=5+6-x
    xln(x/11088)＝0.5
    xln(x/11088)＝0.5
    xlnx＝9.81
    X² +4 X +79等于1300
    x^2/（1-x）=0.99793

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