sqrt(250+(x+1)^2)- sqrt(250+(x-1)^2)=0.005
     sqrt(250+(x+1)^2)- sqrt(25+(x-1)^2)=0.005
     sqrt(0.25+(x+0.001)^2)- sqrt(0.25+(x-0.001)^2)=0.000005
     sqrt(0.25+(x+0.000001)^2)- sqrt(0.25+(x-0.000001)^2)=0.000005
    1／x＋2＋1／x＋7＝1／x＋3＋1／x＋6
    14112-28224*x+14112*x*x=3360*x*x-5376*x+5376
    6x/(x+2000)＝3.73
    6x/(x+2000)＝1.66
    600x＝1.66(2000+x)
    609x²+268x-175=0
    (M+3)(M+4)(M+9)=996
    x=9480+0.0672x
    x*x-5x=2250
    y^2+48y-122=0
    x/(0.10-x)=10.73
    x＾7÷(0.10-x)＾7=2.14*10^-77
    2（x+1）=4（x-1）
    －2/500x²+2/5x＝10
    20%x÷20%=72÷20%
    20%x=72

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