u² - 4u >0
u(u -4) > 0
+ - +
_____₀_____₀_____
0 4
/////////// //////////
Ответ : u < 0 и u > 4
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u² - 4u >0
u(u -4) > 0
+ - +
_____₀_____₀_____
0 4
/////////// //////////
Ответ : u < 0 и u > 4