Question

simplifique as expressoes algebricas.
a) 5(2a+4)


b) -8n-(n+9)+21


c) 3x + (x-2)-(6x-9)


d) (x-y+4)-(2x+6y+10)


e) -(-13y+32)-(-y+3)


f) (a+7b)-(2a+b)-(11a-8b)

Answer 1

a) 5(2a+4) =  10a + 20


b) -8n-(n+9)+21 = -8n -n-9+21  = -8n - n -9 +21 = -9n +12


c) 3x + (x-2)-(6x-9) = 3x + x -2 - 6x +9 = 4x -6x -2+9 = -2x+7


d) (x-y+4)-(2x+6y+10) = x - y +4 -2x-6y-10 =  x -2x -y-6y+4-10 = -x -7y-6




e) -(-13y+32)-(-y+3)  =  13y-32+y-3 = 14y -35



f) (a+7b)-(2a+b)-(11a-8b) = a+7b - 2a-b-11a+8b =  a -2a -11a + 7b -b + 8b =-12a +14b