А)х+(y-z) = x + y - z
б)a-(c+x) = a - c - x
в)m-(n-p) = m - n + p
г)a-(-b-d) = a + b + d
д)a+(b-c+d) = a + b - c +d
е)a-(b-c-d) = a - b + c + d
ж)a-(b+c+d) = a - b - c - d
з)a+(b+c-d) = a + b + c - d
и)(a-b)+(c-d) = a - b + c - d
к)(x+y)-(z+t) = x + y - z - t
л)(m-n)-(k-t) = m - n - k + t
м)(t+s)+(-p-m) = t + s - p + m