3(2×+3)-4(8-1)=3
7(×-1)-2(×-5)=×-5
2(3-×)=3(×-4)+15
3(5-×)-3(1-2×)=42
15-(3-2)+(7-4)
25-(8-5+3)-(12-5-8)
(10-2)-3+(8+7-5)
(9-4+2)-1+(9+5-3)
18-[2+(7-3-8)-10]
-4+[-3+(-5+9-2)]
-6-[10+(-8-3)-1]
-8-[-2-(12)+3]
25-{-2+[6+(-4-1)]}
17-{5-3+[8-(-1-3+5)]}
3-{-5-[8-2+(-5+9)]}
-10-{-2+[+1-(-3-5)+3]}
Soluções para a tarefa
Resposta:
Explicação passo-a-passo:
A)
3(2×+3)-4(8-1)=3
6x + 9 - 4.7 = 3
6x + 9 - 28 = 3
6x - 19 = 3
6x = 3 + 19
6x = 22 (:2)
3x = 11
x= 11/3
B)
7(×-1)-2(×-5)=×-5
7x - 7 - 2x + 10 = x - 5
5x + 3 = x - 5
5x - x = - 5 - 3
4x = - 8
x = - 8/4
x = - 2
C)
2(3-×)=3(×-4)+15
6 - 2x = 3x - 12 + 15
6 - 2x = 3x + 3
6 - 3 = 3x + 2x
3 = 5x
5x = 3
x = 3/5
D)
3(5-×)-3(1-2×)=42
15 - 3x - 3 + 6x = 42
3x + 12 = 42
3x = 42 - 12
3x = 30
x = 30/3
x = 10
E)
= 15-(3-2)+(7-4)
= 15 - (1) + 3
= 15 - 1 + 3
= 14 + 3
= 17
F)
= 25-(8-5+3)-(12-5-8)
= 25 - (3 + 3) - (7 - 8)
= 25 - 6 - (- 1)
= 19 + 1
= 20
G)
= (10-2)-3+(8+7-5)
= 8 - 3 + (15 - 5)
= 5 + 10
= 15
H)
= (9-4+2)-1+(9+5-3)
= (5+2) - 1 + (14 - 3)
= 7 - 1 + 11
= 6 + 11
= 17
I)
= 18-[2+(7-3-8)-10]
= 18 - [2 + (4 - 8) - 10]
= 18 - [ 2 - 4 - 10]
= 18 - [ - 2 - 10]
= 18 - [ - 12]
= 18 + 12
= 30
J)
= -4+[-3+(-5+9-2)]
= - 4 + [- 3 + (4 - 2)]
= - 4 + [- 3 + 2]
= - 4 + [ - 1]
= - 4 - 1
= - 5
L)
= -6-[10+(-8-3)-1]
= - 6 - [10 + (-11) - 1]
= - 6 - [10 - 11 - 1]
= - 6 - [ 10 - 12]
= - 6 - [ - 2]
= - 6 + 2
= - 4
M)
= -8-[-2-(12)+3]
= - 8 - [ - 2 - 12 + 3]
= - 8 - [ - 14 + 3]
= - 8 - [ - 11]
= - 8 + 11
= 3
N)
= 25-{-2+[6+(-4-1)]}
= 25 - {- 2 + [6 +(-5)]}
= 25 - {- 2 + [6 - 5]}
= 25 - {- 2 + 1}
= 25 - { - 1}
= 25 + 1
= 26
O)
= 17- {5 - 3+[8-(-1-3+5)]}
= 17 - { 2 + [ 8 - ( - 4 + 5)]}
= 17 - { 2 + [ 8 - 1]}
= 17 - { 2 + 7}
= 17 - 9
= 8
P)
= 3 -{- 5-[8-2+(-5+9)]}
= 3 - { - 5 - [6 + 4]}
= 3 - { - 5 - 10}
= 3 - { - 15}
= 3 + 15
= 18
Q)
= -10-{-2+[+1-(-3-5)+3]}
= - 10 - {- 2 + [1 - (-8) + 3]}
= - 10 - [- 2 + [1 + 8 + 3]}
= - 10 - [ - 2 + [9 + 3]}
= - 10 - [- 2 + 12]
= - 10 - [10]
= - 10 - 10
= - 20