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Alexei1499
@Alexei1499
August 2022
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m11m
а³-9а - а =
а(а²-9)
- а =
а(а-3)(а+3)
- а =
а(а-3)
- а =
а²+6а+9 (а+3)² (а+3)² а+3
=
а(а-3) - а(а+3)
=
а(а-3-(а+3))
=
а (а-3-а-3)
=
-6а
а+3 а+3 а+3 а+3
При а= -¹/₂
-6 * (-¹/₂)
=
3
= 1,2
-¹/₂ +3 2,5
1 votes
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Answers & Comments
а²+6а+9 (а+3)² (а+3)² а+3
=а(а-3) - а(а+3)=а(а-3-(а+3)) = а (а-3-а-3) = -6а
а+3 а+3 а+3 а+3
При а= -¹/₂
-6 * (-¹/₂) = 3 = 1,2
-¹/₂ +3 2,5