1/*(x-2)+1/(x-1)-1/x≥0
[(x(x-1)+x(x-2)-(x-2)(x-1)]/[x(x-1)(x-2)]≥0
(x²-x+x²-2x-x²+x+2x-2)/[x(x-1)(x-2)]≥0
(x²-2)/[x(x-1)9x-2)]≥0
x²-2=0⇒x=-√2 U x=√2
x=0 x=1 x=2
_ + _ + _ +
-----------------[-√2]--------(0)-------------(1)-------------[√2]------------(2)--------------
x∈[-√2;0) U (1;√2] U [2;∞)