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D( x )
1-x = 0
1-x = 0
1-x = 0
1-x = 0 // - 1
-x = -1 // * -1
x = 1
x in (-oo:1) U (1:+oo)
(2*x-5)/(1-x) < -2 // + 2
(2*x-5)/(1-x)+2 < 0
(2*x-5)/(1-x)+(2*(1-x))/(1-x) < 0
2*(1-x)+2*x-5 < 0
-3 < 0
-3/(1-x) < 0
-3/(1-x) < 0 // * (1-x)^2
-3*(1-x) < 0
( -3 )
-3 < 0
x należy do R
( 1-x )
1-x < 0
-x < -1 // * -1
x > 1
(-oo:1) (1:+oo) -3 - - 1-x + -
x in (-oo:1)
(-oo:1)
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