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enindanila24
enindanila24
08.03.2022 19:33 •  Математика

Перетворити на многочлен вираз (а + в)^2 – (а – в)(а + в)

A)2в^2 - 2ав

Б)2в^2+ 2ав

В)2а^2+ 2ав

Г)2aв-в^2

👇
Ответ:
MR3AlI
MR3AlI
08.03.2022

Б

Пошаговое объяснение:

(a+b)^2-(a-b)(a+b)= a^2+2ab+b^2-(a^2-b^2)= a^2+2ab+b^2-a^2+b^2= 2b^2+2ab

4,6(78 оценок)
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Ответ:
ROMMIT2
ROMMIT2
08.03.2022

Пошаговое объяснение:

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4,4(68 оценок)
Ответ:
анна2255
анна2255
08.03.2022

Смотрите.

1) Обозначаем t — сколько времени они шли в первый день, тогда (t-1) — сколько во второй.

2) Теперь следующее соотношение — про 6 километров. Пускай в первый день они км, а во второй день — s2, тогда нам дано:

s1-s2=6.

3) Вспоминая, что расстояние=время*скорость (s=v*t), подставляем в эту формулу вместо s1 и s2:

(3,5*t)-(3*(t-1))=6.

Упрощаем:

3,5t-3t+3=6;

0,5t=3;

t=6.

ответ: Таким образом, в первый день они шли 6 часов. Во второй день — 6-1=5 (часов во второй день — 3*5 = 15 (км)

Пошаговое объяснение:

4,7(15 оценок)
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