Răspuns:
Explicație pas cu pas:
a) 4 a - 9 a = - 5 a
b) 6 a + 4 a - 12 a = 10 a - 12 a = - 2 a
c) 5 x + 11 x - 12 x + 7 x = 16 x - 5 x = 11 x
d) 7 b - 3 b = 4 b
e) 14 z - 16 z + 2 z = - 2 z + 2 z = 0
f) 24 z - 13 z - 7 z + 9 z = 11 z + 2 z = 13 z
2.
a) 4 a + 5 a - 9 a + 14 a = 9 a - 9 a + 14 a = 14 a
b) 15 x - 4 x + ( 8 x - 5 x ) - 10 x =
= 11 x + 3 x - 10 x =
= 14 x - 10 x =
= 4 x
c) ( 17 y + 13 y - 6 y ) - (32 y - 23 y) =
= 24 y - 9 y =
= 15 y
d) - 8 a + 6 a - 5 a + ( 10 a - 3 a + 5 a ) - 4 a =
= - 7 a + 12 a - 4 a =
= 5 a - 4 a =
= a
