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D( x )
-2.5*x = 0
-2.5*x = 0
-2.5*x = 0
-2.5*x = 0 // : -2.5
x = 0
x in (-oo:0) U (0:+oo)
(100-(2.5*x))/(-2.5*x) > 1 // - 1
(100-(2.5*x))/(-2.5*x)-1 > 0
(100-2.5*x)/(-2.5*x)-1 > 0
(100-2.5*x)/(-2.5*x)+(-2.5*(-1)*x)/(-2.5*x) > 0
100-2.5*x-2.5*(-1)*x > 0
100 > 0
100/(-2.5*x) > 0
100/(-2.5*x) > 0 // * (-2.5*x)^2
-2.5*100*x > 0
( -2.5*x )
0-2.5*x > 0 // - 0
-2.5*x > 0 // : -2.5
x < 0/(-2.5)
x < 0
( 100 )
100 > 0
x należy do R
(-oo:0) (0:+oo) -2.5*x + - 100 + +
x in (-oo:0)
(-oo:0)
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