Question

Oiieh .

vcs podem me ajudar por favor !!!

é para segunda-feira agr .

^-^​

Answer 1

2)

$a) \: \frac{x}{5} = \frac{21}{35} \\ \frac{x}{5} = \frac{3}{5} \\ {\red{x = 3}} \\ \\ b) \: \frac{ \frac{ \frac{3}{4 } }{1} }{5} = \frac{90}{x} \\ \frac{ \frac{ \frac{3}{4} }{1} }{5} = \frac{90}{x} ,x≠0 \\ \frac{15}{4} = \frac{90}{x} \\ 15x = 360 \\ x = 24,x≠0 \\ {\red{x = 24}} \\ \\ c) \: \frac{9}{13} = \frac{x}{26} \\ 234 = 13x \\ 13x = 234 /13 \\ {\red{x = 18}} \\ \\ d) \: \frac{1}{7} = \frac{x - 6}{49} \\ 49 = 7 (x - 6) \\ 7 = x - 6 \\ - x = - 6 - 7 \\ - x = - 13 \\ {\red{x = 13}} \\ \\ e) \: \frac{2x + 1}{10} = - \frac{21}{30} \\ \frac{2x + 1}{10} = - \frac{7}{10} \\ 2x + 1 = - 7 \\ 2x = - 7 - 1 \\ 2x = - 8 \\ {\red{x = - 4}}$