Question

g) 5x-10 = x-1/2
h) 8x-1/2-2x = 3
me ajudemmm, pfv, preciso da resposta urgente ​

Answer 1

g) 5x-10=x+\frac{-1}{2}

5x-10-x=x+\frac{-1}{2}-x

5x-x-10=x+\frac{-1}{2}-x

4x-10=x+\frac{-1}{2}-x

4x-10=x-x+\frac{-1}{2}

4x-10=\frac{-1}{2}

4x-10+10=\frac{-1}{2}+10

4x=\frac{-1}{2}+10

4x=\frac{-1}{2}+\frac{20}{2}

4x=\frac{-1+20}{2}

4x=\frac{19}{2}

\frac{4x}{4}=\frac{\frac{19}{2}}{4}

x=\frac{\frac{19}{2}}{4}

x=\frac{19}{2\cdot 4}

x=\frac{19}{8}

h) 8x+\frac{-1}{2}-2x=3

\left(8x-2x\right)+\frac{-1}{2}=3

6x+\frac{-1}{2}=3

6x+\frac{-1}{2}+\frac{1}{2}=3+\frac{1}{2}

6x+\frac{-1+1}{2}=3+\frac{1}{2}

6x+\frac{0}{2}=3+\frac{1}{2}

6x+0=3+\frac{1}{2}

6x=3+\frac{1}{2}

6x=\frac{6}{2}+\frac{1}{2}

6x=\frac{6+1}{2}

6x=\frac{7}{2}

\frac{6x}{6}=\frac{\frac{7}{2}}{6}

x=\frac{\frac{7}{2}}{6}

x=\frac{7}{2\cdot 6}

x=\frac{7}{12}

Answer 2

Resposta:

G) *Toda fração que não tem número embaixo é considerado como se fosse o número 1 *

5x - 10 = x + 1

_____ _____

1 2

(5X . 2) - (10 . 2) = (1 . X) + (1 . 1)

10X - 20 = 1X + 1

10X - 1X = 20 + 1

9 X = 21

X = 21/9

X = 7/3

simplifica por 3

21÷ 3 = 7

9÷3 = 3