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Евгения35
@Евгения35
August 2022
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Решите пожалуйста 14)
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yarovoe
7х²+х-1+0
(1/x₁+1/x₂)²=1/x₁²+2/x₁x₂+1/x₂²,
1/x₁²+1/x₂²,=(1/x₁+1/x₂)² -2/x₁x₂=((x₁+x₂)/x₁x₂)²-2/x₁x₂=
(-1/71/-/7)²-2/(-1)/7=1+14=15
Ответ:15 3)
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Answers & Comments
(1/x₁+1/x₂)²=1/x₁²+2/x₁x₂+1/x₂²,
1/x₁²+1/x₂²,=(1/x₁+1/x₂)² -2/x₁x₂=((x₁+x₂)/x₁x₂)²-2/x₁x₂=
(-1/71/-/7)²-2/(-1)/7=1+14=15
Ответ:15 3)