Question

Resolva as equações:
a) 2x-1-=4(x-2)
b) 0,3x+2=-10
c) -(9x-15)+2x=33-16x

Answer 1

Resposta:

a)

$2x - 1 = 4(x - 2) \\ \\ 2x - 1 = 4x - 8 \\ \\ - 1 + 8 = 4x - 2x \\ \\ 7 = 2x \\ \\ \pink{ x = \dfrac{7}{2} }$

b)

$(0.3x + 2 = - 10) \times10 \\ \\ 3x + 20 = - 100 \\ \\ 3x = - 100 - 20 \\ \\ 3x = - 120 \\ \\ x = - \dfrac{120}{3} \\ \\ \pink{ x = - 40}$

c)

$- ( 9x - 15) + 2x = 33 - 16 x \\ \\ - 9x + 15 + 2x = 33 - 16x \\ \\ - 9x + 16x + 2x = 33 - 15 \\ \\ - 9x + 18x = 18 \\ \\ 9x = 18 \\ \\ x = \dfrac{18}{9} \\ \\ \pink{ x = 2}$

Bons Estudos!