Question

Reduza os termos semelhantes nas seguintes expressões algébricas:

38) – { 7a – m – [ 4m – (n – m + 3a) – 4a] + n } =

39) 5xy – [ - (2xy + 5x) + [ 3Y – (-XY + X + 3XY)]} =

40) – {x – 2y + y – [ 3x + 5xy + 6y – (x –y) + 8 ]} =

PARTE 2

1) x - 3 = 5

2) x + 2 = 7

3) x - 7 = -7

4) 6x - 4 = 2x + 8

5) 17x - 2 + 4 = 10 + 5x

6) 4x – 10 = 2x + 2

7) 5x + 6x – 16 = 3x + 2x – 4

8) 5(2x -4) = 7(x + 1) – 3

10) 4−1 = 3(−1)

11) 3(−2) = 2−4

12) 2(−1) = 3+4

13) 3(−1)−7=15​

Answer 1

Não entendi o que era pra fazer na parte 2, números 10, 11, 12 e 13

Boa noite ❤️❤️

28/04/22

Answer 2

Resposta:

Explicaçãopasso a passo:

38) – { 7a – m – [ 4m – (n – m + 3a) – 4a] + n } =
= - {7a - m - [4m - n+m-3a-4a]+n}
= - {7a - m - [5m - n -7a] + n}
= - {7a - m - 5m +n + 7a + n}
= - { 14a -6m+2n}
= - 14a + 6m - 2n

____________

39) 5xy – [ - (2xy + 5x) + [ 3Y – (-XY + X + 3XY)]} =
5xy - {-2xy-5x+3y+xy-x-3xy}
5xy + 2xy+5x-3y-xy+x+3xy
9xy+6x - 3y

40)
– {x – 2y + y – [ 3x + 5xy + 6y – (x –y) + 8 ]} =
= -{x-y - [3x +5xy + 6y - x+y+8]}
= -{x - y - [2x+7y+8+5xy]}
= -{x - y - 2x - 7y - 8 - 5xy}
= - { - x - 8y - 8 - 5xy}
= X + 8y + 8 + 5xy

___________
PARTE 2

1) x - 3 = 5
X = 5+3
X = 8

2) x + 2 = 7
X = 7-2
x = 5

3) x - 7 = -7
X = -7+7
X = 0

4) 6x - 4 = 2x + 8
6x-2x = 8+4
4x = 12
x = 12/4
x = 3

5) 17x - 2 + 4 = 10 + 5x
17x+2= 10+5x
17x-5x= 10-2
12x=8
X = 8/12 (:4)/(:4)
x = 2/3

6) 4x – 10 = 2x + 2
4x-2x = 2+10
2x=12
x = 12/2
x = 6

7) 5x + 6x – 16 =3x +2x – 4
11x-16= 5x-4
11x-5x=-4+16
6x= 12
X=12/6
x = 2

8) 5(2x -4) = 7(x + 1) – 3
10x - 20 = 7x+7-3
10x-20 = 7x+4
10x-7x= 4+20
3x= 24
X = 24/3
X = 8