Question

Descupra o valor de x

1) 1/7 = x - 6/49

2) 9/7 = x+ 140/x

3) 3+x /5=x /8

Gente me ajudar por favor !!!

Answer 1

1)

$\frac{1}{7} - x = \frac{6}{49}\\\\-x = \frac{6}{49}- \frac{1}{7}\\\\-x = \frac{6 - 7}{49}\\\\-x = -\frac{1}{49}\\\\x = \frac{1}{49}$

2)

$\frac{9}{7} = \frac{x+140}{x}\\\\9x = (7*x) + (7*140)\\\\9x = 7x + 980\\\\9x - 7x = 980\\\\2x = 980\\\\x = \frac{980}{2}\\\\ x = 490$

3)

$\frac{3+x}{5} = \frac{x}{8}\\\\(3*8) + (8x) = 5x\\\\24 + 8x = 5x\\\\5x - 8x = 24\\\\-3x = 24\\\\x = - \frac{24}{3}\\\\x = -8$

Espero ter ajudado.