( x-5)(x-3)²<0
x-5<0 ∨ (x-3)²>0
x<5 ∨ x-3>0 ∧ x-3<0
. x>3 ∧ x<3
x∈(-∞;5)
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( x-5)(x-3)²<0
x-5<0 ∨ (x-3)²>0
x<5 ∨ x-3>0 ∧ x-3<0
. x>3 ∧ x<3
x∈(-∞;5)