Предмет: Алгебра, автор: ben34

6) Знайди числа, якщо відомо що 5% першого числа та 4% другого разом дорiвнюють 46, а 4% першого числа та 5% другого
- 44. Допоможіть будь ласка!


ВикаБач: 0,04х+0,04у=46; 0,
ВикаБач: 1%=0,01, тому 0,05х+0,04у=46; 0,04х+0,05у=44; 5х+4у+4600; 4х+5у=4400; 20х+16у=18400; 20х+25у=22000; 9у=3600; у=400; 5х+1600=4600; 5х=3000; х=600;

Ответы

Автор ответа: csana1085
0

Ответ:

600 и 400

Пошаговое объяснение:

4% = 4 : 100 = 0,04

5% = 5 : 100 = 0,05

1 число = х

2 число = у

{0,05х + 0,04у = 46 | * 100

{0,04х + 0,05у = 44 | * 100

{5х + 4у = 4600

{4х + 5у = 4400 | * -1,25

{5х + 4у = 4600

{-5х - 6,25у = -5500

{-2,25у = -900

{5х + 4у = 4600

1)

-2,25у = -900

у = -900 : (-2,25)

у = 400

2)

5х + 4у = 4600

5х + 4 * 400 = 4600

5х + 1600 = 4600

5х = 4600 - 1600

5х = 3000

х = 3000 : 5

х = 600

1 число = (х) = 600

2 число = (у) = 400

Автор ответа: matilda17562
0

Ответ:

первое число равно 600, а второе число равно 400.

Объяснение:

Пусть первое число равно а, а второе число равно b. По условию

0,05•а + 0,04•b = 46 и 0,04•а + 0,05•b = 44.

Так как оба условия выполнены одновременно, составим и решим систему уравнений:

{0,05•а + 0,04•b = 46,

{0,05•а + 0,04•b = 46,{0,04•а + 0,05•b = 44;

{0,09•а + 0,09•b = 46 + 44,

{0,01•а - 0,01•b = 46 - 44;

{0,09•(а + b) = 90,

{0,01•а - 0,01•b = 2;

{ а + b = 90 : 0,09

{а - b = 2 • 100;

{a + b = 1000,

{a - b = 200;

{2a = 1200;

{a - b = 200;

{a = 600,

{b = 600 - 200;

{a = 600,

{b = 400.

Проверим полученный результат:

0,05•600 + 0,04•400 = 46 - верно;

{0,04•600 + 0,05•400 = 44 - верно.

Похожие вопросы
Предмет: Английский язык, автор: yporoto10
Open the brackets.

1. This (to be) Peter Brown. He (to be) in his early thirties. His wife (to be) in her late twenties. Her name (to be) Helen. They have two children, a boy and a girl. The boy’s name (to be) Peter. He (to be) ten years old. He (to be) a school-boy. His daughter’s name (to be) Helen. She (to be) only five. She (to go) to the kinder garden.

He (to be)an electronic Engineer. He (to work) for a large company. He (to deal) with after sales service. He (to work) flexi-time. (He (to be) on flexi- time.) He can come in at any time from eight o’clock till ten o’clock in the morning., but his core hours (to be) 10.00 to 12.00 and 14.00 to 16.00.Most of the day he (to have) routine task, but sometimes he (to have) to meet a deadline[have something finished by a fixed day or time. At certain times of the year he (to have) a very heavy workload [amount of work he (to have) to do] but at other times it can (to be) quite all right. His wife (to be) a freelancer. (She (to be) freelance. She (to work) freelance.) She (to work) for different companies at different times. She (not to go) to the office at all. She (to work) from home with her computer. She (to be) a teleworker.

They (to have) many relatives: cousins, uncles and aunts. Peter’s parents (to be) in their mid-fifties. His father (to have) his own company. He (to be) self-employed. His mother is a housewife. She (to take) care about everything and everyone. Ann’s parents (to be) in their early fifties. Her father (to have) a glamorous job. Her father (to be) a pilot. The hours (to be) irregular and antisocial [do not enable one to have a normal social life], but he (not to be) stuck behind a desk and there is a lot of variety. The stress level (to be) quite high. People’s lives (depend) on him. He (to feel) sorry for people who are stuck in a rut or are working in dead-end jobs. Ann’s mother (to be) an economist. She (to work) fixed hours. She(to have) a nine-to-five job. She usually (to get) at work at about 8.45. She (to have) to clock in and clock out[use an electronic card to record the time she(to arrive) in and (to leave) each day. Ann’s sister Kate is her best friend. She is a nurse. She (to do) shift work (she (to be) a shift worker). She (to work) different times each week. Each third day she (to work) nights. She (to like) to help people. She (to like) her job, but she can’t go out much with her friends. She (not to be) married. She (to be) fond of Peter and Helen’s children.

Peter’s hobby (to be) sports. He (to go) wind-surfing, sky-diving and jet-skiing. Ann (to go) scuba-diving. Their son (to go) snorkelling. Their daughter (to do) painting.

They (to be) a happy family.
Предмет: Математика, автор: kazakovaanastasya14