Question

resolva as equações
$\frac{ \times }{3} = 7$
$\frac{ \times }{4} = - 3$
$\frac{2 \times }{5} = 4$
$\frac{2 \times }{3} = - 10$
$\frac{3 \times }{4} = 30$
$\frac{2 \times }{5} - 18$

​

Answer 1

Oie, td bom?

$a) \frac{x}{3} = 7 => x = 7 x3 = 21\\\\b) \frac{x}{4} = -3 => x = -3x4 = -12\\\\c) \frac{2x}{5} = 4 = \\2x = 4x5 = 20\\ x = \frac{20}{2} = 10\\\\d) \frac{2x}{3} = -10 => 2x = -10x3\\2x = -30 \\x = \frac{-30}{2} = -15\\ \\e) \frac{3x}{4} = 30 => 3x = 30x4\\3x = 120\\x = \frac{120}{3}= 40\\\\f)\frac{2x}{5} = 18 => 2x = 18x5\\2x = 90\\x = \frac{90}{2} = 45$

Espero ter ajudado...tchau e bons estudos!!