xtan0.5x=2.857142857
    xtan(0.5x)-2.857142857=0
    xtan(0.5x)-2.857142857=0
    xtan(1.5x)-2.857142857=0
    xtan(0.75x)-2.857142857=0
    x*2=4.3
    x²+3.5x=218.4
    x＋xx=210
    lgx=449.4141
    x＋x×x=210
    2x＝ln(90000×7.35×20×0.3×2÷5×1000000)+2lnx
    105*x-100=0
    B×B＋B＝306
    3X+5:4X+1=5:2
    z^2-1.5z+0.5=0
    13（X+5）=143
    X(x-20)=4125
    10-x=1/3(10-1/2x)
    ln（x/0.0707）=2.5x-2.5*0.0707
    8x+135=1080

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