Question

Ache o valor de x nas questões abaixo:


A

B

C

D

Answer 1

Resposta:

$a) \frac{10}{9}\\\\b)\frac{17}{5}\\\\c)\frac{87}{2}\\\\d) \frac{319}{4}$

Explicação passo-a-passo:

$a) \ \frac{2}{3x} =\frac{3}{4+1} \\2*5=3*3x\\10=9x\\x=\frac{10}{9} \\\\b) \ \frac{2}{x+3}= \frac{12}{x+1}\\2*(x+1)=(x+3)*12\\2x+2=12x+36\\2x-12x=36-2\\-10x=34\\x=\frac{34}{-10}\\x=-\frac{17}{5}\\\\c) \ x+(x+3)=90\\2x+3=90\\2x=90-3\\x=\frac{87}{2} \ ou \ 43,5\\\\d) \ \frac{1}{2}+20+2x=180\\\\\frac{41}{2}+2x=180\\\\\frac{41+4x}{2}=\frac{360}{2}\\\\(41+4x)*2=2*360\\82+8x=720\\8x=720-82\\8x=638\\\\x=\frac{638}{8}\\x=\frac{319}{4} \ ou \ 79,75$