Question

Resolva as equações de 1° grau:

A.
$- 3(3 \times 42) = 2(7 \times - 52)$


b.
$\frac{x}{2} + \frac{1 - x}{5} = \frac{1}{2}$
C.
$\frac{x + 3}{2} + \frac{x + 2}{3} = \frac{ - 1}{2}$
D.
$\frac{3 + x}{2} - (1 - x) = \frac{x - 1}{4}$
E.
$\frac{3x - 1}{2} - \frac{4x + 2}{4} - \frac{2x - 4}{3} = \frac{x - 5}{6}$
F.
$\frac{2(x - 1)}{3} + \frac{3(1 +x) }{2} = \frac{1}{2} - \frac{x - 1}{3}$
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Answer 1

Resposta:

Explicação passo-a-passo:

A

-3(3 x 42) = 2(7x - 52)

-3 x 126 = 14x - 104

-378 = 14x -104

-14x = 274

x = -137/7

B

x/2 + 1-x/2 =1/2

5x +2 (1 - x) = 5

5x +2 -2x = 5

3x + 2 = 5

3x = 3

x =14

C

X+3/2 + x+2/3 = -1/2

3 (x + 3) + 2(x + 2) = -3

5x + 13 + -3

5x = -16

x = -16/5

D

3+x/2 - (1 - x) = x-1/4

3+x/2 -1 -x = x-1/4

2 (3 + x) - 4 + 4x = x -1

2 + 6x = x -1

5x = -3

x = -3/5

E

3x-1/2 - 4x+2/4 - 2x-4/3 = x - 5/6

6 (3x - 1 ) -3 ( 4x + 2) - 4 (2x - 4) = 2(x - 5)

18x - 6 -12x - 6 - 8x +16 = 2x - 10

-4x= -14

x = 14/4 = 7/2

F

2x - 2/3 + 3+3x/2 = 1/2 - x-1/3

4x - 4 + 3(3 + 3x) = 3-2 (x - 1 )

4x - 4 +9 +9x= 3 -2x +2

13x + 2x = 0

15x = 0

x = 0