5 3xy-x+2y 5xy+2x-2y

Question

Вопрос:

Ответ:

Accepted Answer

1) Найдем M + K:

$$M + K = (3xy - x + 2y) + (5xy + 2x - 2y) = 3xy - x + 2y + 5xy + 2x - 2y = (3xy + 5xy) + (-x + 2x) + (2y - 2y) = 8xy + x$$

2) Найдем M - K:

$$M - K = (3xy - x + 2y) - (5xy + 2x - 2y) = 3xy - x + 2y - 5xy - 2x + 2y = (3xy - 5xy) + (-x - 2x) + (2y + 2y) = -2xy - 3x + 4y$$

Ответ: M + K = 8xy + x; M - K = -2xy - 3x + 4y