Предмет: Математика, автор: irishka080581

Найдите значение выражения
а)3,4х+5,7х+6,6х-4,7х при х=3,6;0,8;10
б)3,8м-(2,8м+0,7м) при м= 2,4;8,57
ПОМОГИТЕ ПоЖаЛуЙсТа!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Ответы

Автор ответа: k1NZ3R
1
а) x=3: 33
x=6: 66
x=0: 0
x=8: 88
x=10: 110
б) x=2: 0,6
x=4: 1,2
x=8: 2,4
x=57: 17,1

irishka080581: это уравненине что ли?
k1NZ3R: Нет, это ответы.
irishka080581: но цифры другие
k1NZ3R: Не заметил, что цифры десятичные. Сейчас исправлю.
Автор ответа: vta79
4
3,4х+5,7х+6,6х-4,7х=х*(3,4+5,7+6,6-4,7)
если х=3,6 то 3,6*(3,4+5,7+6,6-4,7)=3,6*11=39,6
если х=0,8 то 0,8*(3,4+5,7+6,6-4,7)=0,8*11=8,8
если х=10 то 10*(3,4+5,7+6,6-4,7)=10*11=110

3,8м-(2,8м+0,7м)=3,8м-2,8м-0,7м=0,3м
если м=2,4 то 0,3*2,4=0,72
если м=8 то 0,3*8=2,4
если м=57 то 0,3*57=17,1

irishka080581: спасибо!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
vta79: пожалуйста)))
Похожие вопросы
Предмет: Русский язык, автор: katy0541
Предмет: Немецкий язык, автор: zhansaya020700
Предмет: Английский язык, автор: AlvaBLR
Контрольная по английскому, помогите, даю, 30 баллов

1. There's no doubt that computers have______________ our lives easier.

(A) done

(B) got

(C) become

(D) made

2. The journalist asked me___________ .

(A) what was my favourite pastime

(B) what is my favourite pastime

(C) what my favourite pastime was

(D) what my favourite pastime is

3. You'll be here tomorrow,____________ ?

(A) isn't it

(B) won't you

(C) will you

(D) will you be

4. There was__________ to eat and drink after the party.

(A) many

(B) lot of

(C) a lot

(D) lots of

5. __________that strange man sitting over there?

(A) Whose

(B) Which

(C) Who's

(D) Who

6. A kangaroo has such strong legs_________ it can jump over a car.

(A) so

(B) so as

(C) as

(D) that

7. Is there_________ in the room?

(A) somebody

(B) something

(C) anybody

(D) anywhere

8. The telephone was__________ by Alexander Graham Bell.

(A) discovered

(B) invented

(C) explored

(D) studied

9. This programme__________ me a lot of money.

(A) cost

(B) costed

(C) had costed

(D) was cost

10. It happened__________ our way home.

(A) in

(B) on

(C) for

(D) about

11. By the time we arrived at the station, the train__________ .

(A) left

(B) has left

(C) had left

(D) was left

12. Mount Everest is___________ mountain in the world.

(A) high

(B) highest

(C) the higher

(D) the highest

13. What do you want__________ ?

(A) me to do

(B) that I'll do

(C) I do

(D) for me to do

14. If he lived in the country he__________ happier.

(A) was

(B) is

(C) will be

(D) would be

15. Rome is famous for its__________ archaeological sites.

(A) ancient

(B) old

(C) old-fashioned

(D) modem

16. ___________ operate a computer is not as difficult as many people think.

(A) To learn

(B) To learning

(C) Learning

(D) Learning to

17. When did he arrive__________ Moscow?

(A) at

(B) on

(C) in

(D) for

18. Nobody________ why people walk or talk in their sleep.

(A) know

(B) knows

(C) knew

(D) is knowing

19. There is oxygen on this planet! We_________ to breathe!

(A) can

(B) will can

(C) be able

(D) will be able

20. What will_________ be like tomorrow?

(A) the weather

(B) a weather

(C) weather

(D) the weathers