Предмет: Математика, автор: saneka228

(0,6 + 2/3) + (–2 1/15).
–14,37 – 11,64 – (–23,85 –18,03).
–4,9 : (–0,2•0,3 – 0,1).
(–15,64:43/5+7,1)•2 2/5.
30 баллов.

Ответы

Автор ответа: nikitapodobed241
1

Ответ:

1.-4/5

2. 15.87

3. 4 242/1075

Пошаговое объяснение:

1.(0.6+2/3)+(-2 1/15)=3/5+2/3-2 1/15=9/15+10/15-31/15=19/15-31/15= -12/15= -3/4

2.–14,37 – 11,64 – (–23,85 –18,03)= -26. 01+41.88=15.87

3.(–15,64:43/5+7,1)•2 2/5=(-391/25*1/43+71/10)*2 2/5=2271/430 *2 2/5=4542/1075=4 242/1075

Автор ответа: grinvalya2001
0

Відповідь:

1) - 0,8

2) 15,87

3) 30,625

4) 8,88

Покрокове пояснення:

1)  (0,6+\frac{2}{3})+(- 2\frac{1}{15})=(\frac{6}{10} +\frac{2}{3})+(- \frac{31}{15})=\frac{3}{5}+\frac{2}{3}- \frac{31}{15}= \frac{3*3}{5*3}+\frac{2*5}{3*5}- \frac{31*1}{15*1}=

\frac{9}{15}+\frac{10}{15}- \frac{31}{15}= \frac{9+10-31}{15} =-\frac{12}{15} =-\frac{4}{5}=-0,8

2) –14,37 – 11,64 – (–23,85 –18,03)=  –14,37 – 11,64 + 23,85 + 18,03=

(23,85 + 18,03) + (–14,37 – 11,64)=(23,85 + 18,03) + (–14,37 +(– 11,64))=

41,88+(–26,01)=  41,88–26,01=15,87

3) –4,9 : (–0,2•0,3 – 0,1).=–4,9 : (–0,06 – 0,1)=–4,9 : (–0,06+( – 0,1))=

–4,9 : (–0,16)=4,9:0,16=490:16=30,625

4) (–15,64:43/5+7,1)•2 2/5.

(-15,64:4\frac{3}{5} +7,1)*2\frac{2}{5} =(-15,64:4,6+7,1)*2,4=(-3,4+7,1)*2,4=

3,7*2,4=8,88

Похожие вопросы
Предмет: Английский язык, автор: Den20022708
One day Petey, who was a puppy, said to his mother, who was a dog: I'd like a boy for Cristmas".
His mother said she thought he could have a boy if he was a very good puppy.
So the day before Christmas Petey's mother asked: " have your been a very good puppy?
" Oh, yes!" said Petey. I didn't frighten the cat.
"you didn't?" asked Petey's mother.
"Well,I just frightened her a little," said Petey. And I didn't chew any shoes.
" Not any?" said his mother.
"Just a teeny-weeny chew", said petey. " And I remembered - well you have been a good little dog. I will go out and get your a boy for Christmas.
But when Petey's mother came back she looked very worried. "How world you like a soft white rabbit with pink ears for Cristmas?" she said to Petey.
"No, thanks," said Petey.
"Don't you want a lovely canary?"
"I'd like a boy," said Petey.
"How adout some little fish?" said Petey's mother.
" i just want a boy," said Petey.
"Petey," said his mother at last,"there are no boys to be found."
"No bous?" cried Petey.
"Not one could I find. They're terribly short of boys this year".
Peter thought he couldn't stand it if he didn't have a boy.
Finally his mother said:"There now, there must be a boy somewhere.
I fhink you ould find some dog who would give his boy away".
"Do you think I could?" asked Petey.
"You can try, can't you?" said his mother.

Say why...
1.    Petey's mother decided to give her son a boy for Christmas.
2.    Petey's mother looked worried when she came back.
3.    Petey's mother couldn't find a boy.
4.    Petey didn't want any pets for Christmas.
5.    Petey decided to find a dog with a boy.

Предмет: Алгебра, автор: alla198309