Предмет: Алгебра, автор: MAMKABOY228

Помогите решить уравнения! Буду очень благодарен!

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Ответы

Автор ответа: sedinalana
0
x²+2xy-3y²=0
решим относительно х
D=4y²+12y²=16y²
√D=4y
x1=(-2y-4y)/2=-3y U x2=(-2y+4y)/2=y
Подставим во 2 уравнение
2*9y²+y²=1
19y²=1
y²=1/19
y=-1/√19⇒x=3/√19
y=1/√19⇒x=-3/√19
2y²+y²=1
3y²=1
y²=1/3
y=-1/√3⇒x=-1/√3
y=1/√3⇒x=1/√3
Ответ (3/√19;-1/√19);(-3/√19;1/√19);(-1/√3;-1/√3);(1/√3;1/√3)
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Предмет: Английский язык, автор: miskakupit
1.) Complete with the correct relative adverb (why, where, when) or pronoun (who, which,
whose):
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was robbed yesterday
2. A boy
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4. The man
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6. This is the church
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7. He came with a friend
waited outside in the car.
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10. 25 December is the day
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11. The bag
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12. The people
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13. Edinburgh is the town
Alexander Graham Bell was born.
14 A man
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15. A woman
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17. The car
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19. July and August are the months ............ Most people go on holiday.
20. The man
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21. He didn't wait at the traffic lights
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22. A horror film was the reason
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23. A police officer
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24. Do you know the reason
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25. A famine was the reason
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SUBJECT AND OBIECT PRONOUNSI
if the relative pronoun is followed by a verb, the relative pronoun is a subject
pronoun. Subject pronouns must always be used.
eg. The apple which is lying on the table is from the new supermarket​