Question

VALE 94 PONTOS
calcule o valor das expressões.
A) ( - $\frac{2}{3} ^{2}$) + ( - $\frac{2}{3}$) + ( - $\frac{2}{3} ^{0}$)=
B) (${2}$ - $\frac{1}{4}$) - (${3}$ - $\frac{1}{2}$)=
C) ($\frac{3}{4}$ - $\frac{5}{6}$) : ($\frac{1}{2}$ + $\frac{1}{4}$)
D) ( -1 + $\frac{1}{2}$) . (-2 - $\frac{3}{4}$)=
QUERO CONTAS VALE 94 PONTOS

Answer 1

a)  -4/3 -2/3 -1/3= -7/3
b) (8/4  - 1/4)  -(6/2 - 1/2)=
         7/4    -     (5/2) =
           7/4 -     5/2=
          7/4 - 10/4 =
               -3/4
c)  (9/12 - 10/12)  : (2/4 - 1/4) =
           ( -1/12)      :   1/4 =
                       -4/12 = simplificando temos -1/3
d) ( -1 + 1/2 ) . (-2/-3/4 )=
(-2/2 +1/2). (-8/4 - 3/4) =
         -1/2 . -11/4 =
         + 11/8
Espero ter ajudado. Esse exercício foi resolvido conforme digitado pela Sabrina 78. 

Answer 2

$a)\begin{pmatrix}-\dfrac{2}{3}\end{pmatrix}^2+ \begin{pmatrix}-\dfrac{2}{3}\end{pmatrix}+ \begin{pmatrix}-\dfrac{2}{3}\end{pmatrix}^0=\\\\ \begin{pmatrix}-\dfrac{4}{9}\end{pmatrix}+ \begin{pmatrix}-\dfrac{2}{3}\end{pmatrix}+\dfrac{1}{1}=\\\\ -\dfrac{4}{9}-\dfrac{2}{3}+\dfrac{1}{1}=\\\\ \dfrac{-4-6+9}{9}=\\\\ \dfrac{-1}{9}$


$b)\begin{pmatrix}\dfrac{2}{1}-\dfrac{1}{4}\end{pmatrix}-\begin{pmatrix}\dfrac{3}{1}-\dfrac{1}{2}\end{pmatrix}=\\\\\begin{pmatrix}\dfrac{8-1}{4}\end{pmatrix}-\begin{pmatrix}\dfrac{6-1}{2}\end{pmatrix}=\\\\\dfrac{7}{4}-\dfrac{5}{2}=\\\\\dfrac{7-10}{4}=\\\\\dfrac{-3}{4}$


$c)\begin{pmatrix}\dfrac{3}{4}-\dfrac{5}{6}\end{pmatrix}\div\begin{pmatrix}\dfrac{1}{2}-\dfrac{1}{4}\end{pmatrix}=\\\\\begin{pmatrix}\dfrac{9-10}{12}\end{pmatrix}\div\begin{pmatrix}\dfrac{2-1}{4}\end{pmatrix}=\\\\\dfrac{-1}{12}\div\dfrac{1}{4}=\\\\\dfrac{-4^{\div4}}{12^{\div4}}=\\\\\dfrac{-1}{3}$

$d)\begin{pmatrix}\dfrac{-1}{1}+\dfrac{1}{2}\end{pmatrix}\cdot\begin{pmatrix}\dfrac{-2}{1}-\dfrac{3}{4}\end{pmatrix}=\\\\\begin{pmatrix}\dfrac{-2+1}{2}\end{pmatrix}\cdot\begin{pmatrix}\dfrac{-8-3}{4}\end{pmatrix}=\\\\\begin{pmatrix}\dfrac{-1}{2}\end{pmatrix}\cdot\begin{pmatrix}\dfrac{-11}{4}\end{pmatrix}=\\\\\dfrac{(-1)\cdot(-11)}{2\cdot4}=\\\\\dfrac{11}{8}$