（x-1)*x/(415-x)=0.00153
    （x-1)*x/(415-x)=0.00046
    90-arctan(14.1/5)-arctan(14.1/16)
    10+（2400-10x）/(x+30)=(2400/x)-2
    x-3(x-2)>4 (1+2x)/3>x-1
    3657-x=0.15*(16650-x)
    arctan(x)+arctan(x/2)=90
    2x-2=x+9
    x^(2)＝-1
    x^(3)＝-1
    【160+2（480-x）】 = 20000
    3a＋1／a^(2)－1＋2/1－a
    2m^(2)+m=3
    484.33+1.05x-110.77/22x^2=0
    x÷32=20
    （x-1)*x/(415-x)=654.81
    （x-1)*x/(415-x)=2155.43
    sin(30+x)/sinx=sin40/ sin30
    x^(2)－17x＝－16
    sin(x)/x^2=0.5

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