Предмет: Математика, автор: nyashka911

Найдите значение выражения:
x^2-xy-9x+9y при х=9 и у=9;
х=-9 и у=9; х=-9 и у=-9

Ответы

Автор ответа: Jasurkhan

0

при x=9 y=9
81-81-81+81=0
при x=-9 y=9
81+81+81=243
при x=-9 y=-9
81-81-81=-81

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