Question

Resolva as equações a seguir considerando que as soluções devem ser números racionais
a) 3 • (3x + 4) = 21
b) 5 • (2x - 1) - 2 • (-4x - 3) = 0
c) 18 - (-x + 4) = 7 • (-2x)
d) x - 3 • (6 - 2x) = -5 • (3 - x)
e) 10 + 8 • (x + 4) = -2x
f) 2 • (c -3) = -2 • (-x + 1)

*DOU COMO MELHOR RESPOSTA*

Answer 1

Resposta:

a) 1

b)-1/18

c)1

d)3/2

e)-21/5

f)4

Explicação passo-a-passo:

a)9x+12=21

9x=21-12

9x=9

x=1

b)10x -5+8x+6=0

18x=-6+5

x=-1/18

c)18x-4=-14x

4x=4

x=1

d)x-18+6x=-15+5x

7x-5x=-15+18

2x=3

x=3/2

e)10+8x+32=-2x

10x=-42

x=-42/10

x=-21/5

f)2x-6=2x-2

x=4

Answer 2

Resposta:

$3.(3x+4)=21\\9x+12=21\\9x=21-12\\9x=9\\x=1$

$5.(2x-1)-2.(-4x-3)=0\\10x-5+8x+6=0\\10x+8x=5-6\\18x=-1\\x=- \dfrac {1}{18}$

$18 - (-x + 4) = 7 . (-2x)\\18+x-4=-14x\\18x+14x=4\\32x=4\\x= \dfrac {1}{9}$

$x-3.(6-2x)=-5.(3-x)\\x-18+6x=-15+5x\\x+6x-5x=-15+18\\2x=3\\x=\dfrac {3}{2}$

$10+8.(x+4)=-2x\\10+8x+32=-2x\\8x+2x=-32-10\\10x=22\\x=\dfrac {11}{5}$

$2.(x-3)=-2.(-x+1)=\\2x-6=2x-2\\2x-2x=6-2\\0$

Explicação passo-a-passo: