Предмет: Математика, автор: gendelfgrey

Упростите выражение (7b−8)(8b+7)−8b(7b+8) и найдите его значение при b=5,6. В ответе запишите найденное значение.

Ответы

Автор ответа: N1Nt3Nd0

0

(7b-8)*(8b+7)-8b*(7b+8)=56b^2+49b-64b-56-56b^2-64b=49b-56
Если b=5,6;то 49b-56=49*5,6-56=274,4-56=218,4
Ответ: 218,4

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