Question

resolva as proporções abaixo:

a) 2x/27=2/9
b) 3/8= 48/x
c) 3x-1/6= 3/4
d) 2x+1/3x= 3/5

Answer 1

a)
$\frac{2x}{27} = \frac{2}{9} \\ \\ 9.2x = 27.2 \\ 18x = 54 \\ x = \frac{54}{18} = 3$

b)
$\frac{3}{8} = \frac{48}{x} \\ \\ 3x = 48.8 \\ 3x = 384 \\ x = \frac{384}{3} = 128$

c)
$\frac{3x - 1}{6} = \frac{3}{4} \\ \\ 4.3x - 4 = 3.6 \\ 12x - 4 = 18 \\ 12x = 22 \\ x = \frac{22}{12} = \frac{11}{6}$
d)

$\frac{2x + 1}{3x} = \frac{3}{5} \\ \\ 5.2x + 5 = 3.3x \\ 10x + 5 = 9x \\ x = - 5$



Bons estudos :p