Question

caucule o valor das seguintes explessoes: e)18-[2+(7-3-8)-10] f)-4+[-3+(-5+9-2)] g)-6-[10+(-8-3)-1] h)-8-[-2(-12)+3] i)25-{-2+[6+(-4-1)]} j)17-{5-3+[8-(-1-3)+5]} k)3-{-5-[8-2+(-5+9)]} l)-10-{-2+[+1-(-3-5)+3]} m){2+[1+(-15-15)-2]} n){30+[10-5+(-2-3)]-18-12} o)20+{[7+5+(-9+7)+3]} p)-4-{2+[-3-(-1+7)]+2} q)10-{-2+[+1+1(+7-3)-]+6 r)-{-2-[-3-(-5)+1]}-18 s)-20-{-4-[-8+(+12-6-2)+2+3]} t){[(-50-10)+11+19]+20}+10 urgente

Answer 1

Boa tarde, Josy.

e) 18-[2+(7-3-8)-10] = 
18-[2+(7-11)-10] = 
18-[2+(-4)-10] = 
18-[2-4-10] = 
18-[2-14] = 
18-[-12] = 
18+12 = 30

f) -4+[-3+(-5+9-2)] = 
-4+[-3+(-7+9)] = 
-4+[-3+2] = 
-4+[-1] = 
-4-1 = -5

g) -6-[10+(-8-3)-1] = 
-6-[10+(-11)-1] = 
-6-[10-11-1] = 
-6-[10-12] = 
-6-[-2] = 
-6+2 = -4

h) -8-[-2(-12)+3] = 
-8-[24+3] = 
-8-[27] = 
-8-27 = -35

i) 25-{-2+[6+(-4-1)]}
25-{-2+[6+(-5)]} = 
25-{-2+[6-5]} = 
25-{-2+1} = 
25-{-1} = 
25+1 = 26

j) 17-{5-3+[8-(-1-3)+5]}
17-{5-3+[8-(-4)+5]} = 
17-{5-3+[8+4+5]} = 
17-{5-3+17} = 
17-{22-3} = 
17-{19} = 
17-19 = -2

k) 3-{-5-[8-2+(-5+9)]} = 
3-{-5-[8-2+4]} = 
3-{-5-[12-2]} = 
3-{-5-[10]} = 
3-{-5-10} = 
3-{-15} = 
3+15 = 18

l) -10-{-2+[+1-(-3-5)+3]} = 
-10-{-2+[+1-(-8)+3]} = 
-10-{-2+[+1+8+3]} = 
-10-{-2+12} = 
-10-{10} = 
-10-10 = -20

m) {2+[1+(-15-15)-2]} = 
{2+[1+(-30)-2]} = 
{2+[1-30-2]} = 
{2+[1-32]} = 
{2+[-31]} = 
{2-31} = -29

n) {30+[10-5+(-2-3)]-18-12} = 
{30+[10-5+(-5)]-18-12} = 
{30+[10-5-5]-18-12} = 
{30+[10-10]-18-12} = 
{30+0-18-12} = 
30-30 = 0

o) 20+{[7+5+(-9+7)+3]} = 
20+{[7+5+(-2)+3]} = 
20+{[7+5-2+3]} = 
20+{[15-2]} = 
20+{13} = 
20+13 = 33

p) -4-{2+[-3-(-1+7)]+2} = 
-4-{2+[-3-(6)]+2} = 
-4-{2+[-3-6]+2} = 
-4-{2+[-9]+2} =
-4-{2-9+2} = 
-4-{4-9} = 
-4-{-5} = 
-4+5 = 1

q) 10-{-2+[+1+1(+7-3)-]+6 = 
10-{-2+[1+1.4]+6} = 
10-{-2+[1+4]+6} = 
10-{-2+5+6} = 
10-{-2+11} = 
10-{9} = 
10-9 = 1

r) -{-2-[-3-(-5)+1]}-18 = 
-{-2-[-3+5+1]}-18 = 
-{-2-[-3+6]}-18 = 
-{-2-[3]}-18 = 
-{-2-3}-18 = 
-{-5}-18 = 
5-18 = -13

s) -20-{-4-[-8+(+12-6-2)+2+3]} = 
-20-{-4-[-8+(12-8)+2+3]} = 
-20-{-4-[-8+4+2+3]} = 
-20-{-4-[-8+9]} = 
-20-{-4-[1]} = 
-20-{-4-1} = 
-20-{-5} = 
-20+5 = -15

 t) {[(-50-10)+11+19]+20}+10 = 
{[-60+11+19]+20}+10 = 
{[-60+30]+20}+10 = 
{-30+20}+10 = 
-10+10 = 0

Bons estudos! :-)