Question

Calcule o valor numérico de 2x+y/3-4x para:

A)x=-2 e y =1

B)x=0 e 4=1

C)x=1/4 e 4 =-18

D)x=1/2 e 4 =6

Answer 1

Basta substituir os valores na equação e operar:

$2x+ \frac{y}{3} -4x \\ \\ a) \\ 2*(-2)+ \frac{1}{3} -4*(-2) \\ \\ -4+ \frac{1}{3} +8 \\ \\ 4+ \frac{1}{3} ==\ \textgreater \ 4 \frac{1}{3}==\ \textgreater \ \frac{13}{3} \\ \\ b) \\2*0+ \frac{1}{3} -4*0 \\ \\ \frac{1}{3} \\ \\ c) \\ 2* \frac{1}{4} + \frac{(-18)}{3}-4* \frac{1}{4} \\ \\ \frac{1}{2} -6-1 \\ \\ \frac{1}{2} -7 \\ \\ \frac{1-14}{2} \\ \\ - \frac{13}{2} ==\ \textgreater \ -6 \frac{1}{2} \\ \\ d) \\2* \frac{1}{2} + \frac{6}{3} -4* \frac{1}{2} \\ \\ 1+2-2 \\ \\ 1$