Question

Alguém me ajuda !!! Vale!!!

Answer 1

5)

$\frac{x}{2} + \frac{x}{3} - \frac{x}{4} =14 \\ \\ \frac{6x+4x-3x}{12} =14 \\ \\ 6x+4x-3x=14.12 \\ 6x+4x-3x=168 \\ 7x=168 \\ x=168/7 \\ x=24$

6)

$x- \frac{x}{2} + \frac{3x}{4} =18 \\ \\ \frac{4x-2x+3x}{4} =18 \\ \\ 4x-2x+3x=18.4 \\ 5x=72 \\ x=72/5 \\ x=14,4$

7)

$\frac{x}{2} + \frac{x}{3} = \frac{7+2x}{3} \\ \\ \frac{3x+2x}{6} = \frac{14+4x}{6} \\ \\ 5x=14+4x \\ 5x-4x=14 \\ x=14$

Answer 2

Oi,

Resolução

5)

x/2 + x/3 - x/4 = 14

MMC = 12

6x/12 + 4x/12 - 3x/12 = 168

Eliminando os denominadores

6x + 4x - 3x = 168
7x = 168
x = 24

x - x/2 + 3x/4 = 28

MMC = 4

4x + 2x + 3x = 72
5x = 72
x = 14,4

x/2 + x/3 = 7 + 2x/3

MMC = 6

3x + 2x = 14 + 4x

x = 14

Espero ter ajudado e bons estudos!