Question

me ajudem por favor!!​

Answer 1

a) R= 5

x - 2/2 = x/20

20(x - 2) = 12x

20x - 40 = 12x

8x = 40

x = 5

b) R= 2/3

x + 1/5 = x/3

3(x + 1) = 5x

3x + 3 = 5x

2x = 3

x = 2/3

c) R= 3

x/6 = x + 2/10

10x = 6(x + 2)

10x = 6x + 12

4x = 12

x = 3

d) R= 3

x - 1/7 = 16/28

28(x - 1) = 16 . 7

28x - 28 = 112

28x = 84

x = 3

e) R= 12

x + 3/x - 2 = 3/2

2(x + 3) = 3(x -2)

2x + 6 = 3x - 6

x = 12

f) R= 5

2/1 = 15 - x/x

2x = 15 - x

3x = 15

x = 5

g) R= 4

20/x + 1 = 16/x

20x = 16(x + 1)

20x = 16x + 16

4x = 16

x = 4

h) R= 9

3/2 = x + 3/x - 1

3(x - 1) = 2(x + 3)

3x - 3 = 2x + 6

x = 9