Предмет: Алгебра, автор: Аноним

Помогите пожалуста!
Відомо що 10<а<15
Оцінити значення вираження 2а-3
Відповідь ?<2а-3<?

Ответы

Автор ответа: Artem112

$10<a<15$

Все части неравенства умножаем на 2:

$2\cdot10<2\cdot a<2\cdot15$

$20<2a<30$

От всех частей неравенства отнимаем 3:

$20-3<2a-3<30-3$

$\boxed{17<2a-3<27}$

sergoalikhan2001: Все части неравенства умножаем на 2:

2\cdot10 < 2\cdot a < 2\cdot152⋅10<2⋅a<2⋅15

20 < 2a < 3020<2a<30

От всех частей неравенства отнимаем 3:

20-3 < 2a-3 < 30-320−3<2a−3<30−3

\boxed{17 < 2a-3 < 27}17<2a−3<27

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