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Объяснение:
+ - + - +
_____-3_________2/3______1___________3_______
x∈(-∞;3)∪[2/3; 1]∪(3; +∞)
+ - + - +
_______-6____________-2______1______2______
x∈(-∞; -6]∪(-2; 1]∪(2; +∞)
+ - + - +
_____-5__________-2_____0____0,5______
x∈(-∞; -5)∪(-2; 0)∪(0,5; +∞)
+ - + - +
_______0_______2______3_________7________
x∈(0;2)∪(3;7)