Question

Alguém me ajuda plmrddss

A) x-3=7
B) x+4=10
C) x+101=300
D) x-279=237
E) x-8=10
F) 9x=18
G) 35x=105
H) 7x-1=13
I) 2(x-1)-7=16
J) 7(x-2)=5(x+3)
K) 2(x-6)= -3(5+x)​

Answer 1

Resposta:

a) x - 3 = 7

x - 3 + 3 = 0

x = 7 + 3

x = 10

b) x + 4 = 10

x + 4 - 4 = 0

x = 10 - 4

x = 6

c) x + 101 = 300

x + 101 - 101 = 0

x = 300 - 101

x = 199

d) x - 279 = 237

x - 279 + 279 = 0

x = 237 + 279

x = 516

e) x - 8 = 10

x + 8 - 8 = 0

x = 10 + 8

x = 18

f) 9x = 18

x = 18 ÷ 9

x = 2

g) 35x = 105

x = 105 ÷ 35

x = 3

h) 7x - 1 = 13

7x - 1 + 1 = 0

7x = 13 + 1

7x = 14

x = 14 ÷ 7

x = 2

i) 2 ( x - 1 ) - 7 = 16

2 ( x - 1 ) - 7 + 7 = 0

2 ( x - 1 ) = 16 + 7

2 ( x - 1 ) = 23

x = 23 ÷ 2

x - 1 = 23/2

x - 1 + 1 = 23/2 + 1

x = 25/2

j) 7 ( x - 2 ) = 5 ( x + 3 )

7x - 14 = 5x + 15

7x - 14 + 14 = 0

7x = 5x + 15 + 14

7x = 5x + 29

7x - 5x = 5x + 29

2x = 29

x = 29 ÷ 2

x = 29/2

k) 2 ( x - 6 ) = - 3 ( 5 + x )

2x - 12 = - 15 - 3x

2x - 12 + 12 = 0

2x = - 15 - 3x + 12

2x = - 3x - 3

2x + 3x = - 3x - 3

5x = - 3

x = - 3 ÷ 5

x = - 3/5