Question

A) x/2 + x/4 + x/2=4
B) 3/4x - 1/2x =-2

Answer 1

Resposta:

A

$\frac{x}{2}+\frac{x}{4}+\frac{x}{2}=4\\\\2\cdot \frac{x}{2}+\frac{x}{4}=4\\\\x+\frac{x}{4}=4\\\\4x+x=16\\5x=16\\\\\frac{5x}{5}=\frac{16}{5}\\\\x=\frac{16}{5}$

b

$\frac{3}{4x}-\frac{1}{2x}=-2\\\\\frac{3}{4x}\cdot \:4x-\frac{1}{2x}\cdot \:4x=-2\cdot \:4x\\\\1=-8x\\\\\frac{-8x}{-8}=\frac{1}{-8}\\\\x=-\frac{1}{8}$