При каких значениях а уравнение х^2+(а^2-1)х-а^2+9=0 имеет только отрицательные корни. - №6046443

При каких значениях а уравнение х^2+(а^2-1)х-а^2+9=0 имеет только отрицательные корни.
- Предмет:
  Математика
- Автор:
  ferrer
- 5 лет назад

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ПОМОГИТЕ!!! ПЛИЗ!!! Очень надо!

1. Read the text and fill in the gaps with verbs in the Present Simple, Present Continuous or will +V, to be going to.

Dear Natasha,
How are you? I was so happy to hear from you recently and finally I (1) … (have) some time to sit down and write you a real letter. First of all, I (2) … (want) to say how wonderful it was to see you again. I am only sorry that my time in Russia – and especially in Vladimir – was so short. But even though it was a brief visit, it was just so good to see you and to have a chance to talk. Thank you for the lovely teacup. It (3) … (be) wonderful. Only when I got back home and had a chance to look at it carefully, did I realize that it was hand-painted. What a gift, the perfect gift for a person who (4) … (love) tea and Russia! I (5) ... (keep) it always. I have a small collection of teacups from all over the world, and it (6) … (be) one of the best items. My teaching is going well. I (7) … (enjoy) it a lot. Tomorrow (8) … (be) the beginning of the new semester, so I (9) … (have) a very busy day. I (10) … (have) eight English classes a week this semester, on Thursdays and Fridays, which is not too bad.I (11) … (still, study) Russian – once a week with my teacher here at the University. And I try to read, watch videos, and speak to whomever I can! I (12) … (learn) Polish or Czech next! I (13) … (do my best) to find some spare time for it in the future. For now, it’s enough to just try to speak this language better!
Thank you very much again and please write when you can.
Much love,Gwen
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Решите уравнения:

а) -8•(11-2х)+40=3(5х-4)
б) 2х-12•(3-х)=1+3(х+2)
в) х+2 / 5=3х-5 / 4
г) 7-х / 6 = 19х-11 / 8
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6.     Цевка – это часть:


  i.
Верхней конечности


  ii.
Грудной клетки



iii.
Клюва


i
v.
Нижней конечности
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