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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
300/x-2 > 0
300*x^-1 > 2
300*x^-1 > 2 // : 300
x^-1 > 2/300
x^-1 > 1/150
1/(x^1) > 1/150
x <> 0
1/(x^1) > 1/150 // * x^2
(x^2)/(x^1) > 1/150*x^2
x^1 > 1/150*x^2
x-1/150*x^2 > 0
x^1*(1-1/150*x) > 0
x < 0
-(abs(x))^1*(1/150*(abs(x))^1+1) > 0 // : -(abs(x))^1
1/150*(abs(x))^1+1 < 0
1/150*(abs(x))^1 < -1 // : 1/150
(abs(x))^1 < -1/1/150
(abs(x))^1 < -150 // ^ 1/1
abs(x) < (-150)^(1/1)
abs(x) < -150
x belongs to the empty set
x < 0
x > 0
x^1*(1-(1/150*x^1)) > 0 // : x^1
1-(1/150*x^1) > 0
1 > 1/150*x^1 // : 1/150
1/1/150 > x^1 // ^ 1/1
(1/1/150)^(1/1) > x
x in (0:150)
x > 0
x in (0:150)
x in (0:150)
(0:150)
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