Question

help gente (é pra amanhã, nao conseguir fazer).

Answer 1

a)
$- 12a + 9a + 5a = \\ - 12a + 14a = 2a$
b)
$15y - 10y - 6y = \\ 15y - 16y = - y$
c)
${4a}^{2} - {10a}^{2} - {6a}^{2} - {4a}^{2} = \\ - {10a}^{2} - {6a}^{2} = - {16a}^{2}$
d)
$- \frac{3}{4} ax + \frac{1}{3} ax - \frac{1}{2}ax = \\ - \frac{9ax + 4ax - 6ax}{12} = \\ - \frac{9ax - 2ax}{12} = \\ - \frac{11 ax}{12}$