Предмет: Математика, автор: Govnotop3000

Решите систему
{17х=4у
{8х-9=3-4у

Ответы

Автор ответа: никккк67
0
17х=4у
8х-9=3-4у

вместо -4y подставляем -17х из первого с минусом

8х-9=3-17х

-25х=6

х=-0,24

у=1,02

Автор ответа: Govnotop3000
0
Большое спасибо
Автор ответа: никккк67
0
незачто
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Раскройте скобки, употребляя глаголы в одном u3 credytowux spemer: Present Simple, Past Simple, Present Continuous unu Past Continuous.

1. Where you (to be) yesterday? I (to be) at home the whole day. How strange. I (to ring) you up at two o'clock, but nobody (to answer). Oh, I (to be) in the garden. I (to read) your book and (not to hear) the telephone.
2. What you (to do) at five o'clock yesterday? – I (to work) in the library. I (to be) there, too, but I (not to see) you.
3. Nina (to celebrate) her birthday yesterday. Her room looked beautiful, there to be) many flowers in it. When I (to come) in, somebody (to play) the piano, two or three pairs (to dance).
4. Listeni Somebody (to play) the pi- ano.
5. I (to like) music very much.
6. When I (to look) out of the window, it (to rain) heavily and people (to hurry) along the streets.
7. What you (to do) at seven o'clock yesterday? – Iſto have) supper.
8. When I (to come) home yesterday, I (to see) that all my family (to sit) round the table. Father (to read) a letter from my uncle, who (to live) in Kiev.
9. Yesterday I (to work) at my English from five till seven.
10. It (to rain) the whole day yesterday.
11. Where your sister (to be) now? She (to be) in her room. She (to do) her homework.
12. He (to brush) his teeth at the moment. He (to clean) them thoroughly morning and night.
13. Don't disturb her while she (to sleep).
14. You (to talk) nonsense. You never (to talk) sense.
15. My mother (to sit) in the sun- light now and I (to set) the table.​