Question

resolva as equações:
a) 2x/3 + 7 = 9
b) 3x + 5/2= 10
c) 2x/5 + 1/2= 5/2
d) 3x/2 + 6 = 9
e) 4x/5 - 7 = 1
f) 2x+3/5 = 7
g) 5x+2/3 = 9
h) 3x/2 + 6/3 = 8x/5
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Answer 1

a) 2x/3 + 7 = 9

2x/3 = 9 -7

2x/3 = 2

2x = 2 . 6

x = 12/2

x = 6

b) 3x + 5/2= 10

3x = 10 - 5/2

3x = 20 - 5/2

3x = 15/2

x = 15/2 / 3

x = 15/2 . 1/3

x = 15/6

x = 5/2

c) 2x/5 + 1/2= 5/2

2x/5 = 5/2 - 1/2

2x/5 = 4/2

2x = 4/2 . 5

2x = 20/2

2x = 10

x = 10/2

x = 5

d) 3x/2 + 6 = 9

3x/2 = 9 - 6

3x = 3 . 2

x = 6/3

x = 2

e) 4x/5 - 7 = 1

4x/5 = 1 + 7

4x = 8 . 5

x = 40/4

x = 10

f) 2x+3/5 = 7

3x = 7 -3/5

3x = 35 -3/5

x = 32/5 / 3

x = 32/5 . 1/3

x = 32/15

g) 5x+2/3 = 9

5x = 9 - 2/3

5x = 27 - 2/3

x = 25/3 /5

x = 25/3 . 1/5

x = 25/15

x = 5/3

h) 3x/2 + 6/3 = 8x/5

8x/5 - 3x/2 = 6/3

16x -15x/10 = 6/3

x/10 = 6/3

x = 6/3 . 10

x = 2 . 10

x = 20

Answer 2

Resposta:

A)X=3

B)X=5/2

C)X=5

D)X=2

E)X=10

F)X=16/5

G)X=5/3

H)X=1/5