Помогите найти значение выражения (a+7b( числитель) a^2 - 7ab (Знаменатель)

August 2022 1 12 Report

Помогите найти значение выражения (a+7b( числитель) a^2 - 7ab (Знаменатель) - 1 (числитель) a ( знаменатель) ) : b( числитель) 7b - a (знаменатель) при a = -0,4, b= корень 8 +5.
Помогите срочно!!!!

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kmike21

Verified answer

$(\frac{a+7b}{a^2-7ab}- \frac{1}{a}): \frac{b}{7b-a}=(\frac{a+7b}{a(a-7b)}- \frac{1}{a})* \frac{7b-a}{b}=$
= $(\frac{a+7b}{(a-7b)}- 1)* \frac{7b-a}{ab}=(\frac{a+7b}{(a-7b)}- \frac{a-7b}{a-7b} )* \frac{7b-a}{ab}=\frac{a+7b-a+7b}{a-7b}* \frac{7b-a}{ab}=$
$=-\frac{14b}{ab}=-\frac{14}{a}=-\frac{14}{0,4}=-35$

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arkatova01 August 2022 | 0 Ответы

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