1.
(AB) = 48cm
M apartine (AB)
(AB) = (AM) + (MB)
(AM) : (MB) = 3 : 5
(AM) x 5 = (MB) x 3
(AB) = (AM) + (MB) | x3
3 x (AB) =3 x (AM) + 3 x (MB)
3 x (AB) = 3 x (AM) + 5 x (AM)
3 x (AB)= 8 x (AM)
3 x 48 cm = 8 x (AM)
144 cm = 8 x (AM)
(AM) = 144 cm : 8
(AM) = 18 cm
(MB) = (AB) - (AM)
(MB) = 48 cm - 18 cm
(MB) = 30 cm