Предмет: Алгебра, автор: makaryun333

найдите значение выражения x^2/x^2+9xy ÷ x/x^2-81y^2 при x 7-9√2, y=5-√2

Ответы

Автор ответа: khadibalaeva

0

Ответ:

Объяснение:

X²/(x²+9xy):x/(x²-81y)=x²/x(x+9y)*(x²-81y²)/x

=x/(x+9y)*(x-9y)(x+9y)/x=

x-9y=7-9√2-45+9√2=-38

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