Question

01. Determine o valor da expressão algébrica
2.74 +4.x - 5
com x= 3.
.
02. Determine o valor das seguintes expressões:
a) 4+ 7.3–15: 5-7 =
b) 12+(35- (10+ 2) + 2] =
c) [(18+3.2):8–5.3] 6 =
d) 2(4-3) -{2-[1+ 4(6-4) -(8/2)(1-3) +10]}=
e) - 300 + 150 + 800-950 =
f) 700 + (-300) + 2000 - (-1200) – 200 =
g) 7+5.8-2.4 =
h) 8+ 7.4 -3.5+ 7 =
i) (7+3)(7-3) -[2(4 +1) -3(4-1)] =
j) 8+[(255–21.3):6] =
k) [12 - (3 + 2.3)]+15 –(2+6:2)=
1) 100+{6.[12+ 8(6-1)-15.3]}
m) 1+{5+[(3*2)+(10*8)]+2}=
n) [(1+2) +6]-{2 + 5*(3-2) +[1+(2-5)]}=​

Answer 1

01.
2.74+4.x-5
2.74+4.3-5
148+12-5
160-5
155

02.
a)

4+7.3-15:5-7
4+21-3-7
21-10
31

b)

12+[35-(10+2)+2]
12+[35-12+2]
12+[23+2]
12+25
37

c)

[(18+3.2):8-5.3].6
[(18+6):8-5.3].6
[24:8-5.3].6
[3-5.3].6
[3-15].6
-12.6
-72

d)

2(4-3)-{2-[1+4(6-4)-(8/2)(1-3)+10]}
8-6-{2-[24-16-4(1-3)+10]}
8-6-{2-[8-3+12+10]}
8-6-{2-[5+22]}
2-{2- 27}
2-25
-23

e)

-300+150+800-950
-300+950-950
650-950
-300

f)

700+(-300)+2000-(-1200)-200
700-300+2000+1200-200
400+3200-200
3600-200
3400

g)

7+5.8-2.4
7+40-8
47-8
39

h)

8+7.4-3.5+7
8+28-15+7
36-8
28

i)

(7+3)(7-3)-[2(4+1)-3(4-1)]
10+4-[8+2-12+3]
14-[10-12+3]
14-[-2+3]
14-1
13

j)

8+[(255-21.3):6]
8+[(255-63):6]
8+[192:6]
8+6
14

k)

[12-(3+2.3)]+15-(2+6:2)
[12-(3+6)]+15-(2+3)
[12-9)]+15-5
3+15-5
18-5
13

l)

100+{6.[12+8(6-1)-15.3]}
100+{6.[20(6-1)-45]}
100+{6.[120-20-45]}
100+{6.[100-45]}
100+{6.55}
100+330
430

m)

1+{5+[(3.2)+(10.8)]+2}
1+{5+[6+80]+2}
1+{5+86+2}
1+93
94

n)

[(1+2)+6]-{2+5(3-2)+[1+(2-5)]}
[3+6]-{7(3-2)+[2-5]}
9-{21-14-3}
9-{7-3}
9-4
5

Espero ter ajudado :)