Alguns de vcs teriam as respostas desse trabalho?
Soluções para a tarefa
Resposta:
Explicação passo-a-passo:
1)
A)
3-2-5 = 1-5= - 4
B)
-2-1-5 = -3-5= - 8
C)
4-6-7+6+7 = 4-6+6-7+7= 4
D)
-3+5-6+8+4 = 2- 6 + 12 = - 4 + 12 = 8
2)
A)
= 4-9+1
= 4-8
= - 4
B)
= 3.25 - (-5) + 7.1
= 75+5+7
= 87
C)
= -1 -(-1)+7.1
= -1+1+7
= 7
D)
= 32-16 - (-8) - 4
= 16 + 8 - 4
= 16 + 4
= 20
3)
A)
5/3 + 2/3 - 1/3 = 7/3-1/3= 6/3
= 2
___________
B)
= -2 + 1/2 - 1/8
= [8.(-2) + 4.1 - 1]/8
= [-16+4-1]/8
= - 13/8
________
C)
= -3/5 . 7/4
= -21/20
________
D)
= (1+1/3): (2 - 3/2)
= (3.1+1)/3 : (2-1,5)
= 4/3 : 0,5
= 4/3 : 1/2
= 4/3 . 2/1
= 8/3
________
4)
(3.48 + 2.32)/5 = (144+64)/5 = 208/5
= 41,6 anos
5)
(1,8-5,6)/2 = - 3,8/2
= - 1,9° C
6)
(3.21 + 2.12)/5 = (63+24)/5 = 87/5
= 17,40
7)
15/10+27/20+36/30 = (1,5+1,35+1,2)/3 = (2,70+1,35)/3= 4,05/3 = 1,35
8. Equação literal (leitura e interpretação)
A)2x
B) x/3
C) x+ 8
D) x - 5
E) 3x
F) x - 3
G) 4.x
H) x + 7
I) 2.(x+9)
J) x - 5
9)
A)
7a+7a - 6a
= 14a - 6a
= 8a
B)
8xy + 4xy - 4xy - 5xy
= 8xy - 3xy
= 5xy
C)
2x + 3y - 1 - 3y + x
= 3x - 1
10)
X^2 - 4x + 3
X = 3
3^2 - 4.3 + 3 = 9-12+3 = 12-12 = 0
11)
A)
3x-3= x + 11
3x - x = 11+3
2x = 14
X = 14/2
X = 7
B)
27x - 9 - 5 = 6x
27x - 14 = 6x
27x - 6x = 14
21x = 14 (:7)
3x = 2
X = 2/3
C)
X - 6 + 4x = 0
5x = 6
X = 6/5
D)
8x = 6x - 2 - 16
8x - 6x = - 18
2x = - 18
X = - 18/2
X = - 9
E)
2x- 6 = - 5x - 20
2x+ 5x = - 20 + 6
7x = - 14
X = - 14/7
X= - 2
F)
3x - 15 + 7x = 15 - 5x
10x - 15 = 5 - 5x
10x + 5x = 5+15
15.x = 20 (:5)
3x = 4
X = 4/3
G)
5 - 4x - 4 = 4x - 12x + 3 - 4
1 - 4x = - 8x - 1
8x - 4x = - 1 - 1
4x = - 2 (:2)
2x = - 1
X = -1/2
H)
6x - 11 = 5x - 3
6x - 5x = - 3 + 11
X = 8
I)
8x - 5 = - 2x + 1
8x + 2x = 1+5
10x = 6 (:2)
5x = 3
X = 3/5