Question

Calcule o valor de cada uma das seguintes expressões:

b) (-1/3)².81/1/3-(-1/3)³

Answer 1

$( -\frac{1}{3} ) ^{2} *\frac{81}{ \frac{1}{3} } -( -\frac{1}{3} ) ^{3} \\ \\ \frac{1}{9}*81*3-( -\frac{1}{27} ) \\ \\ \frac{243}{9}+ \frac{1}{27}= \frac{729+1}{27}= \frac{730}{27}$

Answer 2

(-1/3)² . 81/1/3 - (-1/3)³=
(1/9) . 81/1/3 - (-1/27)=
(1/9) . 27 + 1/27=
3 + 1/27=
M.M.C ->  81/27 + 1/27= 82/27