Question

Resolva as expressões:

a)(3,1)² + 1/2 - 2 × 0,02=

b) (1/2)³-1/4×7/2÷11/8=

Answer 1

A)3,1²+$\frac{1}{2}$-2*0,02=
$( \frac{31}{10})^{2}+0,5-0,04$=
$\frac{961}{100}+0,5-0,04$=
10,07

B)$( \frac{1}{2})^{3}-\frac{1}{4}*\frac{7}{2}$÷$\frac{11}{8}$=
$\frac{1}{8}-\frac{1}{4}* \frac{7}{2}*\frac{8}{11}= [tex]\frac{1}{8}-\frac{7}{2}*\frac{2}{11}$=
$\frac{1}{8}-7*\frac{1}{11}$=
$\frac{1}{8}-\frac{7}{11}$=
$\frac{11-56}{88}$=
$- \frac{45}{88}$
Forma alternativa≈ -0,511364