x²+2√5x+5
    x²+50x-5000
    (2*1.414*x-x^2-1)^(-0.5)*(x/1.414-1)=x/1.414*(1-x^2)^(-0.5)
    2/d+1/(d+4)+1/(d+6)=1/(d+1)
    x+X*0.06=13100
    x2=4
    10.34x^3+120.82x^2-1180.26=0
    8.99x^3+71.23x^2-377.85=0
    ln(x+4)+3*x
    sin(x^2)-4*x
    e^x-3*x
    3x=0.5(x-4x)+1
    40/a-10/2a=10
    -(a-2)/(a+2)*((a+2)^2)/(a+1)
    -3a/(-2)-2/(-2)=2
    x/(x+1)+2/(x-1)=1
    x/(x-3)-1/(x+3)=1
    1/d+1/（d+2）+1/（d+3） = 0
    1/d+1/（d+2）+1/（d+3）＝1/（d+5）
    2800/x-1600/(x/3.5)=4

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