Предмет: Математика, автор: CAHCAH19082010

Запишіть усі чотирицифрові числа, які складено из цифр 1,2,3,4. Скіки чисел ви одержали. Запишіть усі чотирицифрові числа, якіскладеноіз цифр 0,1,2,3.Скіки чиселви одержали. Поясніть, чому відповіді в першому і другому випадках відрізняються

Ответы

Автор ответа: yana6656
2

Ответ:

1234, 1243, 1324, 1342, 1423, 1432,

2134, 2143, 2314, 2341, 2413, 2431

3124, 3142, 3214, 3241, 3412, 3421.

4123, 4132, 4213, 4231, 4312, 4321.

___________________

1023, 1032,2013,2031

3012,3021,1203,1230,

1302,1320,2103,2130,

2301,2310,

3102,3120,3201,3210

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Помогите сделать упражнения: 
1.Open the brackets using the Present
Simple Tense

1)
Mary often (cook) breakfast.

2)
She (clean) her flat in the evening.

3)
We (go) shopping every Sunday.

4)
I usually (watch) TV after work.

5)
My relatives (live) in the country.

6)
Jack (study) at the University.


2.Put the verbs in brackets into the
Past Simple Tense

1)
He (do) well at school last year.

2)
She (swim) in the river last summer.

3)
They (go) to the theatre yesterday.

4)
Ann (take) an exam last week.

5)
Granny (buy) some milk yesterday.

 


3.Open the brackets using the Future
Simple

1)
They (arrive) late tomorrow.

2)
He (speak) to her in English.

3)
They (stay) at that hotel tonight.

4)
John (finish) his work before noon.

5)
They (send) the letter soon.

 


 4.Open the brackets

1)
Kate often (to spend) summer on the Black Sea.



a) spend               b) spends             c) will spend


2)
He (to get up) early in the morning yesterday.



a) get up              b) got up              c) gets up


3)
Tomorrow my friend (to go) to the
library to read for classes.


a) goes                 b) went                c) will go


4)
My Mum (to cook) a very tasty dinner yesterday.



a) cooks               b) cook                c) cooked


5)
I (to be) lucky to meet him.


a) is                      b) am                   c) are


6)
My classes usually (to begin) at 8 a.m.


a) began               b) begins              c) begin


7)
Last Sunday I (to have) dinner late.



a) had                            b)
will have          c) has



8)
After classes he sometimes (to stay)
at the University.



a) will stay           b) stayed              c) stays

 
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