（20-x）（10x+100）=2090
    X*0.09=154740.64
    （x+1)/（4x-2）
    3x²-6x+5=77
    1/2=4x^10+x^5
    3x-2x^11-1/1-x=4x^10+x^5
    3x-2x^11-1/1-x=0
    3x-2x^11=1
    5*x^2=1.4
    10*x-2.5*x^2=1.2
     100P-(580+40×100)-100× (P × 13%-5)×12%=60
    df
    -1166+721.2/(1+(x/12*3))+444.74/(1+(x/12*6))+36.06/(1+(x/12*18))=0
    -0.1055x+11.6610
    x*x-500*x+100=0
    (4*sqrt((0.5*x)^2+1))/(x*sqrt(4*x^2+1)*sqrt((1-x^2/64)^2+0.0025*x^2))=1
    (10x-61.25)*22.25-(122.5+5x)(x-5)=0
    -180=atan(0.5*x)-90-atan(2*x)-atan((0.05*x)/(1-(x^2)/64))
    -180=arctan0.5*x
    20x-(20*(800-x))-(60*(400-x))

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