найдите значение выражения [tex] \frac{49}{7b- b^{2} } - \frac{7}{b} b= -3[/tex]. Created by sterkhovalerra. algebra-ru

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sterkhovalerra @sterkhovalerra

August 2022 1 7 Report

найдите значение выражения
[tex] \frac{49}{7b- b^{2} } - \frac{7}{b}

b= -3[/tex]

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Banabanana

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$\cfrac{49}{7b-b^2} - \cfrac{7}{b}= \cfrac{49-7(7-b)}{b(7-b)} = \cfrac{49-49+7b}{b(7-b)} =\cfrac{7b}{b(7-b)}=\cfrac{7}{7-b}$

при b=-3

$\cfrac{7}{7-b} = \cfrac{7}{7-(-3)}=\cfrac{7}{7+3}=\cfrac{7}{10}=0.7$

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