Question

Resolva as equações em R:
A) 64x=256 b) 25x+2=125x+5 C) 2x-15=16 D)1/27=3x+2

Answer 1

64x=256⇒ $2^{6}x = 2^{8}$⇒x$\frac{ 2^{8} }{ 2^{6} }$⇒x=2²⇒x=4  ou simplesmente x=256÷64⇒ x=4

25x+2=125x+5⇒ 100x=-3⇒ x=-3/100

2x-15=16⇒ 2x=31⇒x=31/2

$\frac{1}{27}$=3x+2⇒1=81x+54⇒81x=-53⇒x=-53/81

Answer 2

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