Question

Tìm x biết:

a) ( x-2)³ = 27

b) 2^x + 2^x+3= 144

c) ( 2x-3)²= 25

d) ( 2x-1)¹⁰= ( 2x-1) ¹⁰⁰

Answer 1

c)(2x-3)^2 = 25

   (2x-3)^2 = 5^2 

=> 2x-3 = 5

    2x = 8

  x= 4

Answer 2

a) ( x-2)³ = 27

(x-2)^3 = 3^3

x-2 = 3

x= 5

b) 2^x + 2^x+3= 144

2^x + 2^x * 8 = 144

2^x (1+8) =144

2^x = 144:9

2^x = 16

2^x = 2^4

x=4

c) ( 2-3)²= 25

Câu c sao ko có x.

d) ( 2x-1)¹⁰= ( 2x-1) ¹⁰⁰

(ko bt)