1. Решите уравнение: х4- 3х2+ 2 = 0

А) +- 1; 2

Б) +- 1 ; +- 

В) 1; 

Г) 1; 2

2. Найдите корни уравнения:   х2          1

                                                        ___  =   ___

                                                         х - 1        х - 1

А) 1

Б) -1 ; 1

В) - 1

Г ) другой ответ

3. Решите уравнение :   y2             9

                                           ___  =     _____

                                          y +5          y + 5

A) 9

Б) - 5

В) +- 3

Г) 3

Решите пожалуйста !!!!!!!!!!!!!!!!!!!!!

Закончите урав. реакций.Подпишите класс веществ.
1)Na+H2O=

2)Ba+H2O=

3)Cu+H2o=

4)Cu+HCL=

5)K2O+HCL=

6)H2SO4+KOH=

7)KOH+SO2=

8)Fe(OH)2+Co2=

Помогите вставить буквы в пропуски... Read the story of John Carr , who changed his career and decide in which gap (1-10) each phrase ( A-K) should go. There is one extra phrase that you do not need to use. In his own way , John Carr , 31 , was a rebel . Everything about him suggested becoming a teacher, (1)_______________ After two years as a lawyer, he realised he would prefer to be in the classroom. He now works as a trainee teacher (2)___ in Guildford, Surrey. “I used to wake up each morning and think: ‘Oh no; (3)------------------------ .’ And I just thought, well, maybe that’s what life is like. It is such a relief to find it is not. I left law about 18 months ago. I was with a large firm in Brighton. I felt like I wasn’t doing (4) - I suppose I could have moved to a different firm (5)------------------------- . But, to be honest, I didn’t really want to spend five or six years waiting. I think I knew what (6)_______________ — I just needed to finally go and do it. Both my parents were teachers, I was drawn to teachers and people said (7) ____________ . I suppose I rebelled against that. It didn’t surprise my friends and family when I finally accepted that. I am really enjoying what i am doing. I am learning on the job, teaching pol­itics, economics and geography. Every day is different. There is (8)______________________________________________ I feel I’m doing something that is socially beneficial. But I am here for myself as much as for the students. In the future I’d like to work (9) I feel there is a wide choice. I don't have any regrets. Not even giving up (10)_________________ 

A)  anything constructive

B) at a private secondary school

C) but be turned to law 

D) difficult starting a new job

E) I don’t want to go in today

F) I would be good at the job

G) I’'d always wanted to do

H) in different types of schools and possibly teach overseas

I) so much variety, freedom and creativity

J) the prospect of earning all that money as a lawyer

K) to gee if that made a difference to my job satisfaction

Поздней осенью Ира обнаружила несколько луковиц с проросшими корешками и решила посадить их в ящик на балконе. Ира надела пальто, вышла на балкон, посадила лук в ящик с землей и полила свой «огород». Однако урожай ей собрать не удалось. Объясни, почему не выросли листья лука?

чем вы можете объяснить увеличение численности городских жителей