Question

Resolva em R as equacoes
a) 64x = 256
b)25x +2 = 125x +5

Answer 1

A) 64x=256  ==> x = 256/64 ==> x = 4

b) 25x+2=125x+5 ==> 125x -25x = 2 - 5 ==> 100x = - 3 ==> x = - 3/100

C) 2x-15=16 ==> 2x = 16+15 ==> 2x = 31 ==> x = 31/2

D)1/27=3x+2       mmc = 27
  1 = 81x + 54 
81x = 1 - 54

x = - 53/81

Answer 2

a)

64x = 256 

x = 256 / 64

x = 4

b)

25x + 2 = 125x + 5 

2 - 5 = 125x - 25

- 3 = 100x

x = - 3 / 100  < --- fração irredutivel