а) 18 - 3(4 + 5у) + 9у - 7 = 18 - 12 - 15у + 9у - 7 = -1 - 6y
б) -6(5b - 17 + 3k) - (b - k) = -30b + 102 - 18k - b + k = -31b - 17 -17k
в) 3a - (2a - (a - 7)) = 3a - 2a + a - 7 = 2a - 7
г) 6d - (3d - (( k - 8d) - 2k)) = 6d - 3d - k + 8d + 2k = 11d - k + 2k = 11d + k
а) 18 - 3(4 + 5у) + 9у - 7 = 18 - 12 - 15у + 9у - 7 = -1 - 6y
б) -6(5b - 17 + 3k) - (b - k) = -30b + 102 - 18k - b + k = -31b - 17 -17k
в) 3a - (2a - (a - 7)) = 3a - 2a + a - 7 = 2a - 7
г) 6d - (3d - (( k - 8d) - 2k)) = 6d - 3d - k + 8d + 2k = 11d - k + 2k = 11d + k