x÷(x+2300)=0.4
    x÷(x+773)=0.75
    x÷(x+713)=0.73
    x÷(x+3750)=0.05
    x÷(x+3750)=0.22
    300/1.2x+400/x=260
    300/1.2x577+400/x=260
    300/（1+0.2）x+400/x=260
    300/（1+0.2）+400/x=260
    8/x+2=17.6/x+4
    arctanw=45
    arctanw=1
    w√[(w^2+2)(w^2+50)]=1
    w√(w^2+2)(w^2+50)
    w√(w^2+2)(w^2+50)
    arctanw+arctan0.25w = 90
    3s^2+20s+27=0
    arctanw+arctan0.25w = 90
    arctanw+arctan0.2w = 90
    arctanw+arctan0.25w = 90

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