Odpowiedź:
2)
o - obwód = m + 2 + 3 + k + r + k + 3 + 2 = m + 2k+ r + 10
P - pole = 2 * m + r * k = 2m + kr
3)
4/3x + 5/8x + 2xy = 32/24x + 15/24x + 2xy = 47/24x + 2xy =
= 1 23/24x + 2xy = (47x + 48xy)/24 = x(47 + 48y)/24
4xy -2x - 3y + 8x - xy- 2x = - 4x + 3xy - 3y
- abc + 3ba - 1/2ab + 2bac - 1/4ba - 2/3cab - 3/4ab =
= - abc + 3ab - 1/2ab+ 2abc - 1/4ab - 2/3abc - 3/4ab =
= abc - 2/3abc + 3ab - 6/12ab - 8/12ab - 9/12ab=
= 1/3abc + 3ab - 23/12ab = 1/3abc + 3ab - 1 11/12ab =
= 1/3abc + (2 12/12)ab - (1 11/12)ab= 1/3abc + 1 1/12ab
(2a + 3x-4c + 5d) -(a -7x + 2c - 6d) =
= 2a + 3x - 4c + 5d - a + 7x - 2c + 6d = a + 10x - 6c + 11d
