Предмет: Математика, автор: kiryanebogaboy73

спростити вираз 3а-7а та знайди його значення якщо а=-0,7

Ответы

Автор ответа: TutorOnline

Ответ: 2,8

Пошаговое объяснение:

3а-7а; 3*(-0,7)-7*(-0,7)=-2,1+4,9=4,9-2,1=2,8

Автор ответа: OblivionFire

Ответ:

2,8.

Пошаговое объяснение:

Упростим выражение. Приведем подобные члены.

$3a-7a=-4a.$ Подставим при а=-0,7 ⇒ $-4*(-0,7)=2,8.$

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