Question

tìm x

( x + 1/2 ) ( x + 1/4 ) + ( x + 1/8 ) + ( x + 1/16 ) = 1 

Answer 1

x+ ( 1/2+1/4+1/8+1/16)=1

x+15/16 = 1

x= 1- 15/16

x= 1/16

Answer 2

Nếu bỏ hết các dấu ngoa6c5 thì ta có :

x + 1/2 + x + 1/4 + x + 1/8 + x + 1/16 =1

=> 5.x + 1/2 + 1/4 +1/8 + 1/16 =1 

=>5.x +15/16 = 1

=> 5.x = 15/16  + 1 = 31/16

=> x = 31/16 : 5

x = 31/80

Vậy x bằng 0,3875

Answer 3

Nếu bỏ các dấu ngoặc thì ta có :

X + 1/2 + X + 1/4 + X + 1/8 + X + 1/16 = 1

=> 4.X + 1/2 + 1/4 + 1/8 + + 1/16 = 1

=> 4.X + 15/16 = 1

=> 4.X = 1 - 15/16 = 1/16

=> X = 1/16 : 4 

=> X = 1/64

Vậy X bằng 1/64