Question

допоможіть будь ласка ​

Answer 1

Ответ:

1) (x+7.8) - (8.1+x) = x + 7.8 - 8.1 - x = (x - x) + (7.8 - 8.1) = 0 - 0.3 = -0.3

2) -(6.3-y) - (9.1+y) = -6.3 + y - 9.1 - y = (y - y) - (6.3 + 9.1) = 0 - 15.4 = -15.4

3) -(7.2-m+k) + (5.3+k) = -7.2 + m - k + 5.3 + k = (m - k + k) + (-7.2 + 5.3) = m - 1.9

4) (b-c-4.8) - (-c-b-4.8) = b - c - 4.8 + c + b + 4.8 = (b + b) + (-c + c) + (4.8 - 4.8) = 2b + 0 + 0 = 2b