Question

calcule o valor de x nas equações.
3x/5-1/2=x-2/5

X-4/5-x-5/2=x+2/10

Answer 1

Explicação passo-a-passo:

3x/5-1/2=x-2/5

$\frac{3x}{5} - \frac{1}{2} = x - \frac{2}{5} \\ \frac{6x - 5}{10} - x = \frac{2}{5} \\ \frac{4x - 5}{10} = \frac{2}{5} \\ \frac{4x}{10} = 2 \\ x = \frac{20}{4} = 5$

X-4/5-x-5/2=x+2/10

$\frac{x - 4}{5} - \frac{x - 5}{2} = \frac{x + 2}{10}$

$\frac{10x - 40}{10} - \frac{10x - 50}{10} = a \\ \frac{20x + 50}{10} = \frac{x + 2}{10} \\ \frac{20x + 50}{10} - \frac{ x + 2}{10} \\ \frac{19x + 48}{10} = 0 \\ 19x = 48 \times 10 \\ x = \frac{480}{19} = 25.2631....$