Question

Determine :::::(A)::::::(B)::::::(C):::::::(D)

Answer 1

Explicação passo-a-passo:

a)

$\sf A=(-1-1)\cdot\left(-2+\dfrac{5}{4}\right)-\dfrac{1}{2}$

$\sf A=(-2)\cdot\left(\dfrac{-8+5}{4}\right)-\dfrac{1}{2}$

$\sf A=(-2)\cdot\left(-\dfrac{3}{4}\right)-\dfrac{1}{2}$

$\sf A=\dfrac{6}{4}-\dfrac{1}{2}$

$\sf A=\dfrac{3}{2}-\dfrac{1}{2}$

$\sf A=\dfrac{2}{2}$

$\sf A=1$

b)

$\sf B=\dfrac{-\dfrac{5}{8}}{+\dfrac{5}{12}}$

$\sf B=-\dfrac{5}{8}\cdot\dfrac{12}{5}$

$\sf B=-\dfrac{60}{40}$

$\sf B=-\dfrac{3}{2}$

c)

$\sf 1-A+B=1-1-\dfrac{3}{2}$

$\sf 1-A+B=-\dfrac{3}{2}$

d)

$\sf (A+B)^2=\left(1-\dfrac{3}{2}\right)^2$

$\sf (A+B)^2=\left(\dfrac{2-3}{2}\right)^2$

$\sf (A+B)^2=\left(-\dfrac{1}{2}\right)^2$

$\sf (A+B)^2=\dfrac{1}{4}$