Предмет: Математика, автор: 3331737

(2х-5)-(3-2х)=5х-11. 3а-2(4-5а)=3+12а решите уравнения пожалуйста. срочно​

Ответы

Автор ответа: liska120803
1

Пошаговое объяснение:

(2x - 5) - (3 - 2x) = 5x - 11 \\ 2x - 5 - 3 + 2x = 5x - 11 \\ \\ - 5 - 3 + 11 = 5x - 2x - 2x \\ 3 = x

3a - 2(4 - 5a) = 3 + 12a \\ 3a - 8 + 10a = 3 + 12a \\ 3a + 10a - 12a = 8 + 3 \\ a = 11

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1. They …… on rafting in Siberia every summer.

A go B is going C goes D are going

2. Patricia ……to spend more time in the sunshine to be more relaxed.

3. A want B wants C is wanting D have wanted It is the …… film on greenhouse gases which I have ever watched.

A badly B worst C worse D bad

4. When you called me, I …… a book about animals which are under threat of extinction.

A read B will read C was reading D have read

5. Gary was enjoying the scenery while Jane …… the caves.

A explore B had been exploring C had explored D was exploring

6. That was the day …… they took up quad racing .

A where B what C why D when

7. He switched on the computer, connected the Internet and …… the report from the research station.

A readed B had read C read D was reading

8. He wishes he …… a chance to find a part-time job.

A had had B had C will have D was having

9. I …… to attend a concert tonight. Do you want to join me?

A am going B go C will go D went

10. The flowers …… two days ago.

A were planted B are planted C will be planted D have been planted

11. Hurry up! The exhibition …… in an hour.

A closes B will close C is closing D is going to close

12. Hot milk is …… for a sore throat than traditional medicine.

A useful B usefully C most useful D more useful

13. The exam was not easy but the students …… pass it.

A should B were able to C could D had to

14. Bill and Susan …… to Paris in 2014.

A go B have gone C went D had gone

15. The survival course …… I did last year was a bit dangerous.

A why B which C who D when

16. Factories should …… to stop using fossil fuels.

A to try B try C trying D will try

17. When we arrived at the airport, the plane …… off already.

A took B was taking C had been taking D had taken

18. Different social media sites …… every day.

A were used B are used C will be used D have been used

19. I think Steve …… an interesting job and earn a good salary.

A finds B will find C find D is going to find

20. You …… look after children all day. You can hire a babysitter.

A shouldn’t B don’t have to C can’t D mustn’t

21. I …… go out today. I am preparing a presentation on remote regions of Australia.

A can’t B mustn’t C don’t have to D shouldn’t

22. My parents are looking forward to …… on holiday.

A go B going C to go D will go

23. The clerk agreed …… customers as soon as he finishes the report.

A help B to help C helping D will help

24. The spicy food cooked in India …… delicious.

A tastes B taste C is tasting D tasted

25. If Bill had more experience, he …… in the charity campaign.

A participates B would participate C will participate D would have participated

26. Jack …… live in a big city, but now he lives in a village.

A used to B lived C would live D had lived

27. Jack is happy. He finally …… to living in a big city.

A adapts B has adapted C is adapting D has been adapting

28. If you fly this rescue helicopter too often, it …… down faster.

A would break B broke C would have broken D will break

29. Please, turn the radio off. I …… the a difficult maths problem.

A solve B solved C have solved D am solving

30. The scenery is both dark …… beautiful.

A nor B or C and D with
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