Question

Determine o valor de cada soma algébrica: a) 8 - (-6 + 10) b) -10 + (6 - 4) c) 2 + (2 + 5 - 7) d) -5 + (2 - 4) - (7 - 1) e) 50 - (-12 + 6) - (8 - 34)​

Answer 1

a)

$8-\left(-6+10\right)\\\\=8-4\\\\=4$

b)

$-10+\left(6-4\right)\\\\=-10+2\\\\=-8$

c)

$2+\left(2+5-7\right)\\\\=2+0\\\\=2$

d)

$-5+\left(2-4\right)-\left(7-1\right)\\\\=-5-2-\left(7-1\right)\\\\-7-\left(7-1\right)=-13\\\\=-13$

e)

$50-\left(-12+6\right)-\left(8-34\right)\\\\=50-\left(-6\right)-\left(8-34\right)\\\\=50-\left(-6\right)-\left(-26\right)\\\\=82$