Question

a+(b-c) раскройте скобки
x-(y+2)
m-(-n-k)

Answer 1

$a + (b - c) = a + b - c \\ x - (y + 2) = x - y - 2 \\ m - ( - n - k) = m + n + k$

Answer 2

а+b-c
x-y-2
m+n+k и всё.