Предмет: Математика, автор: zabavaugolnikova

4. Упростите выражение -6(3,4х – 5) + (57 – 2,6 x) - 7(0,21x – 1) и вычислите его значение при х= 15 - 20 помогите ​

Ответы

Автор ответа: Svita14
0

Ответ:

-6(3,4х – 5) + (57 – 2,6 x) - 7(0,21x – 1)= -20,4х+30+57-2,6х-1,47х+7= -20,4х-2,6х-1,47х+30+57+7= -24,47х+94

Если х=15, то -24,47*15+94= -367,05+94= -273,05

Если х= -20, то -24,47*(-20)+94= 489,4+94=583,4

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