Question

Tìm x
a , ( 12x - 4³ ) . 8³ = 4.8⁴ 
b , ( 3x - 6 ) . 3 = 3^{4
c , 2448 : [ 119 - ( x - 6 ) ] = 24}
 

Answer 1

a  <=>12x-4^3=32

     <=>12x=96

<=>x=8

b,    <=>3x-6=27

       <=>3x=33

       <=>x=11

c,    <=>119-(x-6)=102

       <=>x-6=17

       <=>x=23

hok tot

Answer 2

a) ( 12x - 4³ ) . 8³ = 4.8⁴

=> ( 12x - 4³ ) : 4 = 8⁴ : 8³

=> ( 12x - 4³ ) : 4 = 8

=> 12x - 4³ = 8 . 4

=> 12x - 64 = 32

=> 12x = 96

=> x = 8

b) ( 3x - 6 ) . 3 = 3⁴

=> ( 3x - 6 ) = 3⁴ : 3¹

=> 3x - 6 = 3³

=> 3x - 6 = 27

=> 3x = 33

=> x = 11

c) 2448 : [ 119 - ( x - 6 ) ] = 24

=> 119 - ( x - 6 ) = 102

=> x - 6 = 7

=> x = 13