Question

A x/2+x/3=5 B x/4+x/3=7 C x/2+x/5=7

Answer 1

Resposta:

a) 6

b) 12

c) 10

Explicação passo-a-passo:

$\frac{x}{2} + \frac{x}{3} = 5\\\\\frac{x.3 +x.2}{2.3} =5\\\\\frac{3x+2x}{6} = 5\\3x+2x = 5.6\\\5x=5.6\\\\\5x=30\\x=6$

$\frac{x}{4} +\frac{x}{3} =7\\\\\frac{x.3+x.4}{4.3}=7 \\\\\frac{3x+4x}{12}=7\\7x =7.12\\\\\x= \frac{7.12}{7} \\x=12$

$\frac{x}{2} +\frac{x}{5}=7\\\\\frac{x.5+x.2}{5.2} = 7\\\\\frac{5x+ 2x}{10} = 7\\ 7x= 7.10\\x =10$