Respostas
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}
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