Предмет: Алгебра, автор: Footlit3846

Помогите пожалуйста 7. Даю 20 баллов

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Ответы

Автор ответа: mikael2
0
5x²-3xy-y²-x²-3xy=4x²-6xy-y²
проверим
5x²-3xy-y²-4x²+6xy+y²=x²+3xy
(*)=4x²-6xy-y²
Автор ответа: krusen
0
(5х²-3ху-у²)-(*)=х²+3ху
(5х²-3ху-у²)-(4х²-6ху-у²)=х²+3ху
раскрывает скобки
5х²-3ху-у²+4х²+6ху+у²=х²+3ху
сокращаем
х²+3ху=х²+3ху
ответ
*=4х²-6ху-у²
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