помогите пожалуйста! номера 242,244,246,248. срочно надо!. Created by manjka24. algebra-ru

242.х (см) - ширинах+17 (см) - длинаР=134 см - периметр2(х+х+17)=1342(2х+17)=1342х+17=134 : 22х+17=672х=67-172х=50х=50 : 2х=25 (см) - ширина25+17=42 (см) - длинаОтвет: 25 см и 42 см.244.х - первая сторонау - вторая сторона{2(x+y)=18{7y-3x=11{x+y=9{7y-3x=11x=9-y7y-3(9-y)=117y-27+3y=1110y=11+2710y=38y=38 : 10y=3.8 (см) - вторая сторонах=9-3,8=5,2 (см) - первая сторонаОтвет: 5,2 см и 3,8 см.246.х - первый острый уголу - второй острый угол{x+y=90{x-y=54Складываем уравнения системы:x+x+y-y=90+542x=144x=144 : 2x=72 - первый острый угол72+у=90у=90-72у=18 - второй острый уголОтвет: 18°, 72°, 90°.248.х - меньший уголу - больший угол{5x+2y=360 | умножим на "3"{4x-3y=30 | умножим на "2"{15x+6y=1080{8x-6y=60Складываем уравнения системы:15x+8x+6y-6y=1080+6023x=1140x=1140 : 23x=1140/23x=49 ¹³/₂₃ - меньший угол4 * (1140/23) - 3y=304*1140 - 23*3y= 23*304560 - 69y=690-69y=690-4560-69y= - 3870y= -3870 : (-69)y=3870/69y=1290/23y= 56 ²/₂₃Ответ: 5 меньших углов по 49 ¹³/₂₃ ° и 2 больших угла по 56 ²/₂₃ °. jasmin8jasmin8Номер242)Пусть х см ширина,то длина 17+х см.Периметр равен 2х+2(17+х) или 134 см(по формуле нахождения периметра прямоугольника-сумма всех сторон)Получаем уравнение 2х+2(17+х)=134;2х+34+2х=134;4х=100;х=25-ширина;25+17=42а другиехорошо,сейчасспасибоНовые вопросы в АлгебраСрочно!!!!!!!!!!!!!!!!!!! Слева 8СРОЧНО!!!!!!!!!!!! 4 НАДО, ФОТКА НИЖЕ!!!!СРОЧНО!!!!! Фотка прикреплена ниже!58. Прочтите текст. Байкал- самое глубокое озеро на планете. Наибольшая глубина Байкала- 1642 метра Байкал находится в Сибири между Иркумской областью…и Республикой Бурятия живописные береже обера пянутся на 2000 километро а площадь водной поверхности составляем 31 722 кв. км Прибрежные территорию уникальным разнообразием флоры и фауны. Вода в Байкале удивительно прозрачна: видно дно на глубине 40 метров Запасы пресной воды в Байкале огромны: объем озера- 23 615 куб. км. Байкал является частью сгромной гической системы охватывающей сомни мысяч квадратных километров. Специалисты са, что снижение уровня воды в Байкале даже на 10 см приведем к необратимым катастрофическим последствиям для всей Восточной Сибири Есть план построить на берегу озера завод, который будет выпускать байкальскую воду в буты эколса сильно обеспокоены сложившейся ситуацией. Предположим, что завод будет выпускать 40 миллионов трехлитровых бутылок в год. "Будет ли заметно понижение уровня воды в Байкале, вызванное деятельностью завода в течение двух лет? Ответ обоснуйте.Сможет ли Аркадий 15 декабря 2021 года купить мотоцикл за 270 тыс. рублей при условии, что может тратить только проценты по вкладу? Ответ обоснуйте, Предположим, что ювелирный завод хочет выпустить партию из 500 обручальных колец 585 пробы весом в 5 грамм Хватит ли 862 тонны руд Наталкинского место…рождения для производства колец? Ответ обоснуйте Пробой в ювелирных изделиях называют процентное содержание драгоценных металлов. Например, в серьгах 585 пробы содержится 58,5% золота. Срочно решите!!!Даю 30 балов!!!СРОЧНО!!!!!! Чи буде графіком рівнянь 3x-4y=5; -15x+20y=-25 і 1/3x-4/9y=5/9 та сама пряма Даю 30 баллов. Задача на фото:алегребра дуже строчноПредыдущийСледующийВместе мы знаем большеЭтот сайт использует cookies Политика Cookies . 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помогите пожалуйста! номера 242,244,246,248. срочно надо!...

manjka24 @manjka24

July 2022 1 6 Report

помогите пожалуйста!
номера 242,244,246,248.
срочно надо!

Answers & Comments

jasmin8 242.
х (см) - ширина
х+17 (см) - длина
Р=134 см - периметр

2(х+х+17)=134
2(2х+17)=134
2х+17=134 : 2
2х+17=67
2х=67-17
2х=50
х=50 : 2
х=25 (см) - ширина

25+17=42 (см) - длина
Ответ: 25 см и 42 см.

244.
х - первая сторона
у - вторая сторона

{2(x+y)=18
{7y-3x=11

{x+y=9
{7y-3x=11

x=9-y
7y-3(9-y)=11
7y-27+3y=11
10y=11+27
10y=38
y=38 : 10
y=3.8 (см) - вторая сторона

х=9-3,8=5,2 (см) - первая сторона
Ответ: 5,2 см и 3,8 см.

246.
х - первый острый угол
у - второй острый угол

{x+y=90
{x-y=54
Складываем уравнения системы:
x+x+y-y=90+54
2x=144
x=144 : 2
x=72 - первый острый угол

72+у=90
у=90-72
у=18 - второй острый угол

Ответ: 18°, 72°, 90°.

248.
х - меньший угол
у - больший угол

{5x+2y=360 | умножим на "3"
{4x-3y=30 | умножим на "2"

{15x+6y=1080
{8x-6y=60
Складываем уравнения системы:
15x+8x+6y-6y=1080+60
23x=1140
x=1140 : 23
x=1140/23
x=49 ¹³/₂₃ - меньший угол

4 * (1140/23) - 3y=30
4*1140 - 23*3y= 23*30
4560 - 69y=690
-69y=690-4560
-69y= - 3870
y= -3870 : (-69)
y=3870/69
y=1290/23
y= 56 ²/₂₃

Ответ: 5 меньших углов по 49 ¹³/₂₃ ° и 2 больших угла по 56 ²/₂₃ °.

jasmin8jasmin8

Номер242)Пусть х см ширина,то длина 17+х см.Периметр равен 2х+2(17+х) или 134 см(по формуле нахождения периметра прямоугольника-сумма всех сторон)Получаем уравнение 2х+2(17+х)=134;2х+34+2х=134;4х=100;х=25-ширина;25+17=42