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Angela11001
Angela11001
23.04.2023 07:40 •  Математика

Решите уравнение а) дробь: в числителе-3х+2 в знаменателе-4.+ в числителе 2х-5 в знаменателе 3.все это равно -1 б) дробь: в числителе-5-2х в знаменателе в числителе 1-3х в знаменателе 5 все это равно 2

👇
Ответ:
ksomarova777
ksomarova777
23.04.2023

-3*(-3х+2)+4(2х-5)=-1*12

-9х+6+8х-20=-12

-9х+8х=-12-6+20

-1х=2

х=2/(-1)

х=2

ответ :2

 

 

4,4(86 оценок)
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Ответ:
tseng7788
tseng7788
23.04.2023

Пошаговое объяснение:

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4,6(44 оценок)
Ответ:
domna0404
domna0404
23.04.2023

В решении.

Пошаговое объяснение:

Расстояние по трассе между двумя посёлками 1540 м. Из этих посёлков одновременно навстречу друг другу выехали два велосипедиста. Скорость первого равна 3 м/с, скорость второго 4 м/с. Какое расстояние будет между велосипедистами через 3 мин после начала движения? Через какое время после начала движения велосипедисты встретятся?

Формула движения: S=v*t

S - расстояние            v - скорость             t – время

3 минуты=60*3=180 секунд.

1)Найти расстояние 1 велосипедиста:

3*180=540 (м).

2)Найти расстояние 2 велосипедиста:

4*180=720 (м).

3)Какое расстояние будет между велосипедистами через 3 мин после начала движения?

1540 - (540+720)= 280 (м).

4)Через какое время после начала движения велосипедисты встретятся?

Общее расстояние 1540 м.

Общая скорость 3+4=7 (м/сек).

Общее время: 1540 : 7 = 220 (сек.)

4,5(21 оценок)
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