а) (x - y) + b(y - x) = x - y + by - bx = x - y - bx + by = x - (y + bx) + by = x - (y + bx) + yb = x - (y + bx) + by = (x - y)(1 - b)
б) c(a - b) + d(b - a) = ca - cb + db - da = ca - cb + db - da = a(c - d) - b(c - d) = (a - b)(c - d)
в) p(z - k) - q(k - z) = pz - pk - qk + qz = pz + qz - pk - qk = (p + q)(z - k)
г) 5n(3 - x) - 2m(x - 3) = 15n - 5nx - 2mx + 6m = 15n + 6m - 5nx - 2mx = (15 + 6m)(n - 2x)
а) (x - y) + b(y - x) = x - y + by - bx = x - y - bx + by = x - (y + bx) + by = x - (y + bx) + yb = x - (y + bx) + by = (x - y)(1 - b)
б) c(a - b) + d(b - a) = ca - cb + db - da = ca - cb + db - da = a(c - d) - b(c - d) = (a - b)(c - d)
в) p(z - k) - q(k - z) = pz - pk - qk + qz = pz + qz - pk - qk = (p + q)(z - k)
г) 5n(3 - x) - 2m(x - 3) = 15n - 5nx - 2mx + 6m = 15n + 6m - 5nx - 2mx = (15 + 6m)(n - 2x)