Question

efetue as adições e subtrações
a)4+13-21=
b)(+8)-(-5)=
c)(-8)+(-5)=
d)(-3)+(+9)=
e)-13+7-2-8+15-1=
f)+22-3-14-5+24+12=
G)(-2)-(-3)+(+5)=
H)(+2)+(-7)=
j)(+6)+(-7)-(-2)=​

Answer 1

Resposta:

a) 4+13-21=

$=17-21\\=-4$

b)(+8)-(-5)= $13$

c)(-8)+(-5)= $-13$

d)(-3)+(+9)= $6$

e)-13+7-2-8+15-1=

$=-6-2-8+15-1\\=-8-8+15-1\\=-16+15-1\\=-1-1\\=-2$

f)+22-3-14-5+24+12=

$=19-14-5+24+12\\=5-5+24+12\\=0+24+12\\=24+12\\=36$

G)(-2)-(-3)+(+5)=

$=\left(-2\right)+3+\left(5\right)\\=1+\left(5\right)\\=6$

H)(+2)+(-7)=

$=2-7\\=-5$

j)(+6)+(-7)-(-2)=​

$=\left(6\right)-7-\left(-2\right)\\=-1-\left(-2\right)\\=-1+2\\=1$