Question

a) 20 – {-10 + [+20 – (-20 + 10)]}

b) 20 – [-8 + (-15 + 9)]}

c) 4 – {-6 – [+7 + (-3 + 1)] +( 5-8)}

d) -2 – {-[-(-1 + 4)]}

e) 12 + {-2 + [-(-3+6-7) – (-2 + 1)]}

f) -20 + {-6 + [(-2+6-9-8+5) - (-3 +2)] -2}

g) 10 – {-6 + [(-12 -3+5) – 8]}

h) -42 - [150 + (-350 + 355) - (-200 +200-5) – 95] – 160

façam pfvr​ (n precisa ser todas)

Answer 1

Espero ter ajudado.

A)

$20-\left\{-10+\left[20-\left(-20+10\right)\right]\right\}\\\\=20-20\\\\=0$

B)

$20-\left[-8+\left(-15+9\right)\right]\\\\=20-\left(-14\right)\\\\=34$

C)

$4-\left\{-6-\left[7+\left(-3+1\right)\right]+\left(5-8\right)\right\}\\\\=4-\left(-14\right)\\\\=18$

D)

$-2-\left\{-\left[-\left(-1+4\right)\right]\right\}\\\\=-2-3\\\\=-5$

E)

$12+\left\{-2+\left[-\left(-3+6-7\right)-\left(-2+1\right)\right]\right\}\\\\=12+3\\\\=15$

F)

$-20+\left\{-6+\left[\left(-2+6-9-8+5\right)-\left(-3+2\right)\right]-2\right\}\\\\=-20-15\\\\=-35$

G)

$10-\left\{-6+\left[\left(-12-3+5\right)-8\right]\right\}\\\\=10-\left(-24\right)\\\\=34$

H)

$-42-\left[150+\left(-350+355\right)-\left(-200+200-5\right)-95\right]-160\\\\=-42-65-160\\\\=-267$