-3/4X^2+3/2x+12=0
    [a^2/（a+1）-a+1]+(a^2-1) /(a^2+2a+1) -(a-1) /a=999
    [a^2/（a+1）-a+1]+(a^2-1) /(a^2+2a+1) -(a-1) /a
    60/1500=x/1410
    1500/60=x/1410
    cos1/x
    x^2+x-1=0
    2x^2-4x-5=0
    5x-x=24
    x^3-40x^2-3200x+6400=0
    0.71567cos(x)+0.97765*sin(x)*sin(x/2)-0.23855 = 0
    x^3-40x^2-3200x+6400=0
    x^3-40^x3-3200x+6400=0
    5x-x=24
    1/2x-25%x=10
    3+25%x=90
    x+25%x=10
    60%x+25=85
    tan(x+π/6)=2cosx
    y=250+50

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