Предмет: Математика, автор: bayandinay

x^4+2x^3-x-2=0 помогите решить
подробно, спасибо!

Ответы

Автор ответа: wejde
0
x⁴+2x³-x-2=0
x(x³-1)+2(x³-1)=0
(x+2)(x³-1)=0
x=-2
x³=1
x=1
Ответ: x=1, x=-2
Автор ответа: GusHou
0
X^4+2x^3-x-2=0
x^3(x + 2) - (x+2) = 0
(x^3 - 1) ( x+2) = 0
Значит либо x равен -2, либо 1
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UNIT 5

VOCABULARY

1 Complete the sentences with the verbs in the box. There are two extra verbs.

attend do fail learn leave pass revise take

0 In England, you can do three or four subjects at A level.

1 If you’re tired, why don’t you----- a break for a while?

2 Ed’s really excited – he’s managed to----- his exam!

3 In the UK, students can -----school when they’re 16.

4 Children first------ primary school at the age of five.

5 I can’t come out because I have to------ for my exams.


2 Complete the sentences with a word from each box.

Chill get (x2) looked meet take

after off on with out up up with

0 What time do you get up in the morning?

1 The first thing I do when I get home is -----my uniform!

2 The villagers ------him when he was ill.

3 I really -----my new classmates – they’re so nice!

4 Let’s arrange a time to----- each other, shall we?

5 I’m just going to----- in front of the TV this evening.


3 Match 1–5 with a–h to make sentences with get. There are two extra options.

0 Don’t stay out too long; it’s beginning to get c

1 It’s 7 pm already! I must get----

2 If I’m late for class, I will get-----

3 My mum will be furious if I get-----

4 Jen loves her voluntary work; she gets-----

5 When I have too much to do, I always get-----

a into trouble.

b to school.

c dark.

d good marks.

e a tattoo.

f better.

g stressed.

h a lot out of it.


4 Complete the sentences with the correct form of the words in capitals.

0 Sam needs to make a decision about where he’s going to study next year. DECIDE

1 My granddad has a great------ of stamps. COLLECT

2 Ben had to------ against some older boys in the race. COMPETITION

3 Our school has just received a big----- for the new swimming pool! DONATE

4 My favourite subject at school is Design and------ . TECHNOLOGICAL

5 I’m getting a good-------- at this university. EDUCATE



GRAMMAR


5 Match 1–5 with a–f to make conditional sentences.

0 If we’re free on Saturday, f

1 If there’s enough snow,

2 If it’s a fine day,

3 We’ll go by train

4 We won’t go to a café

5 We’ll buy a drink

a we’ll sit in the sun.

b if there aren’t any buses.

c if we’re thirsty.

d we’ll go ski-ing.

e if we haven’t got much money.

f we’ll have a day out.


6 Complete the first conditional sentences with the correct forms of the verbs in brackets.

0 If Ted passes (pass) his A levels, he will feel (feel) very excited.

1 If you---- (not hurry), the bus---- (leave) without you!

2 What--- (you/do) if Mark----- (not come) tomorrow?

3 Sasha -----(be) disappointed if she -----(fail) her test.

4 If you -----(not have) an umbrella, I---- (give) you mine.

5 Amy----- (not finish) her homework if she----- (not start) now.


7 Complete the sentences with which, who, where or that. Leave out the relative pronoun if the sentence is correct without it.

0 That’s the man who lives next door to us.

1 My dad’s the one----- does the cooking in our family.

2 I can’t find a T-shirt----- I want to buy.

3 I like going to shops----- there are lots of books!

4 Martin always wanted to drive a car ------goes really fast!

5 The school canteen is the place ------you have lunch.


8 Choose the correct option. If the sentence is correct without a relative pronoun, choose –.

1 I managed to buy the book which / – / who I wanted.

2 My brother is the person that / – / which helps me with

Maths!

3 The bag which / who / where was stolen belonged to me.

4 My room is the place where / which / who I relax after

school.

5 An engineer is someone which / who / – can design cars.уйста СРОЧНО
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