Предмет: Математика, автор: goodnavim

Помогите пожалуйста кто разбирается! Виконати дії над комплексними числами заданими в алгебраїчній формі:

a)z1+z2;

b)z1−z2;

c )z1⋅z2;

d )z1:z2.

z1 = −4+4 i

z2 = 1−√3 i

Ответы

Автор ответа: Хуqожнuк
1

z_1=-4+4i\\\\z_2=1-\sqrt3 i\\\\z_1+z_2=-4+4i+1-\sqrt3 i=(-4+1)+(4-\sqrt 3)i=-3+(4-\sqrt 3)i\\\\z_1-z_2=-4+4i-(1-\sqrt3 i)=(-4-1)+(4+\sqrt 3)i=-5+(4+\sqrt 3)i\\\\z_1\cdot z_2=(-4+4i)\cdot(1-\sqrt3 i)=-4+4i+4\sqrt3 i-4\sqrt 3 i^2=\\=-4+4i+4\sqrt3 i+4\sqrt 3=4(\sqrt3-1)+4(\sqrt3+1)i\\\\z_1:z_2=\dfrac{-4+4i}{1-\sqrt3 i}= \dfrac{(-4+4i)(1+\sqrt3 i)}{(1-\sqrt3i)(1+\sqrt3i)}=\dfrac{-4+4i-4\sqrt3 i-4\sqrt3}{1+3}=\\\\=-1+i-\sqrt 3i-\sqrt3=-(1+\sqrt3)+(1-\sqrt 3)i

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Put each verb in brackets into a suitable past verb form.

The Search for the Lost City

When Professor Mallory, the famous archaeologist,(1) ...invited..............(invite) me to take part in his expedition to find the Lost City of the Himalayas, 1(2)..............................(not hesitate) to accept

his invitation. Mallory (3)..............................(discover) an ancient map showing the position of the city, although no European (4)...............................(ever go) to the area before. In fact, most of Mallory's colleagues either (5)..............................(believe) that the city(6)..............................(never exist) or (7)..............................(feel) that it(8)..............................(vanish) long ago and (9)..............................

(become) simply a legend. According to the Professor, the builders of the city(10)..............................(hide) it among the mountains in order to protect its immense riches. He(11)..............................(believe) that the descendants of these ancient people(12)..............................(still keep) themselves apart from the rest of mankind for the very same reasons. So when we (13)..............................(set off) on a cool May morning towards the distant mountains, each of us (14)..............................(look forward) to exciting discoveries. For a week or more we (15)..............................(climb) higher and higher, following the map, which Mallory(16).............................. (study) from time to time. Then one afternoon, while we(17)..............................

(rest) at the top of a valley, we (18).........................(notice) that a rider on a horse(19).......................(wave) at us from the other side of the valley. A rider whose clothes(20)..............................(shine) like gold!

3.Put each verb in brackets into a suitable past verb form. Only use the past perfect where this is absolutely necessary.

1 While I (try) …...... to get my car started, a passing car (stop) ...................................and the driver (offer)...................................to help me.

2 The police (pay)...................................no attention to Jos complaint because she (phone)...................................them so many times before.

3 Mary (not wear)..............................her glasses at the time, so she (not notice)..............................what kind of car the man (drive).....................

4 Nick (lie)...................................down on the grass for a while, next to some tourists who (feed)...................................the ducks.

5 Tony (admit)...................................that he (hit)...................................the other car, but said that he (not damage)...................................it.

6 Sorry, I (not listen)..............................to you. I (think)..................................about something else.

7 Helen (feel)...................................very tired, and when she (finish)............................ her work, she (fall)...................................asleep.

8 The police (get)...................................to Toms house as fast as they could, but the burglars (disappear)....................................

9 I (phone)...................................you last night but you (not answer)..........................What (you do)...................................?

10 We (not go)...................................out yesterday because it (rain)................................