(6*60)*(x/0.4*2)/1000=4122.67
    (-m^2+5m)/(-m^2+m+4)+3
    x^3+255x^2+1250x=(x+50)(3x^2+510x+1250)
    x(x+5)(x+250)=(x+50)(x^2+510x+1250)
    x(x+5)(x+250)=(x+50)(3x^2+510x+1250)
    1/x+1/(x+5)+1/(x+250)=1/(x+50)
    1/x+1/(x+50)+1/(x+250)=1/(x+50)
    x(x+50)(x+250)=(x+50)(x+5)(x+250)+x(x+250)(x+50)+x(x+50)(x+50)
    x^3+255x^2+1250=(x+50)×(3x^2+510x+1250)
    x^3+255x^2+1250=(x+50)(3x^2+510x+1250)
    5x^3+1275x^2+6250=(5x+250)(3x^2+510x+1250)
    5x^3+1275x^2+6250=(5x+250)×(3x^2+510x+1250)
    A*A+A＝240
    sin(x)+x=5/x
    sinx/x+cosx=-1
    3sinx/x+cosx=-1
    3sinx/x+cosx=1
    6sinx/x+cosx=-1
    6sinx/x+cosx=1
    6sinx/x+cosx=1

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