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podenas1969
podenas1969
31.01.2020 22:35 •  Математика

Впервом туре участвовали 9 мальчиков и столько же девочек. во второй тур в 3 раза меньше человек. сколько человек во второй тур?

👇
Ответ:
DmitriiSh197
DmitriiSh197
31.01.2020
9×2=18 столько детей участвовало
во второй тур
4,6(66 оценок)
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Ответ:
avoka
avoka
31.01.2020

Пошаговое объяснение:

1 | Верно ли утверждение <<Если перед скобками стоит знак "-" то можно опустить скобки, изменив знаки слагаемых стоящих в скобках на противоположный>>  - ответ: да

2| Раскрыть скобки в выражении: -(a+b-c)  = -а-b+c

3| Записать равенство двух выражений без скобок : 4 = у + 3

4| Упростить выражение: 10 - (х - 6)  =10 -x + 6= 16 -x

5| Запишите коэффициент буквенного выражения: - 2а=  -2 ·a  коэффицмент равен (-2  )

6| Упростить выражение: 13х · (-3)  = -39х

7| Раскрыть скобки: (-а) · (6b-3)  =-6ab+3a

8| Раскрыть скобки: (5y + 4x - 1)*3  = 15y+12x-3

9 Привести подобные слагаемые: 3,6х + х - 2,4х  = 2,2x

10| Упростить выражение: 5а + 2b - 3а + 7b = 2a +9b

4,7(100 оценок)
Ответ:
ROMMIT2
ROMMIT2
31.01.2020

Пошаговое объяснение:

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4,4(68 оценок)
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