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LilyWay
@LilyWay
August 2022
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решите неравенство x^2-9>0
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kirichekov
Verified answer
X²-9>0
x²-3²>0
(x-3)*(x+3)>0 метод интервалов:
(x-3)*(x+3)=0
х-3=0 или x+3=0
x₁=-3, x₂=3
++++(-3)-----(3)+++++>x
x∈(-∞;-3)∪(3;∞)
4 votes
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Answers & Comments
Verified answer
X²-9>0x²-3²>0
(x-3)*(x+3)>0 метод интервалов:
(x-3)*(x+3)=0
х-3=0 или x+3=0
x₁=-3, x₂=3
++++(-3)-----(3)+++++>x
x∈(-∞;-3)∪(3;∞)