Question

A) 9 ( × + 7 ) = 81
B) - ( × + 3 ) = - 2
C) 6 × = 168
D) 4 × - 3 = 33
E) 5 × + 7 = 67
F) 6 × - 2 × = 28
G) 2 × + 5 = 91

K) 6 x - 10 = 2 × + 14
L) 12 × - 46 = 5 × + 3
M) 5 ( x - 1 ) = - 30
N) 2 ( x - 4 ) = 16
me ajudem nessas pvr ​

Answer 1

Resposta:

A)9(x+7)=81

9x+63=81

9x=81-63

9x=18

x=18/9

x=2

B)-(x+3)=-2

-x-3=-2

-x=-2+3

-x=1

(-1)-x=1. multiplica o (-x) por (-1) para tirar o sinal.

x=1

C)6x=168

x=168/6

x=28

D)4x-3=33

4x=33+3

4x=36

x=36/4

x=9

E)5x+7=67

5x=67-7

5x=60

x=60/5

x=12

F)6x-2x=28

4x=28

x=28/4

x=7

G)2x+5=91

2x=91-5

2x=86

x=86/2

x=43

K)6x-10=2x+14

6x-2x=14+10

4x=24

x=24/4

x=6

L)12x-46=5x+3

12x-5x=3+46

7x=49

x=49/7

x=7

M)5(x-1)=-30

5x-5=-30

5x=-30+5

5x=-25

x=-25/5

x=-5

N)2(x-4)=16

2x-8=16

2x=16+8

2x=24

x=24/2

x=12