Question

Tìm x 

5^x . 5¹⁴ = 5⁷⁸

(24 - x)³ = 64 

Answer 1

5^x . 5¹⁴ = 5⁷⁸

5^x = 5⁷⁸ : 5¹⁴

5^x = 5^{78 - 14}

5^x = 5⁶⁴

=> x = 64

 

(24 -x)³ = 64

(24 -x)³ = 64 = 4³

(24 -x)³ =4³

=> 24-x = 4

x= 24-4

x  = 20

=> x = 20

tick nhé Ngothitolan

Answer 2

a/ => 5^x = 5⁷⁸ : 5¹⁴

=> 5^x = 5⁶⁴

=> x = 64

b/ => (24 - x)³ = 4³

=> 24 - x = 4

=> x = 20

 

Answer 3

5^x . 5¹⁴ =5⁷⁸

5^x = 5⁷⁸:5¹⁴

5^x = 5⁶⁴

=> x = 64 

Vậy x = 64

( 24 - x )³ = 64

( 24 - x )³ = 4³

=> 24 - x = 4 

=>        x = 24 -4 

=>        x = 20 

Vậy x = 20

Answer 4

5^x.5¹⁴=5⁷⁸
5^x+14=5⁷⁸
=>x+14=78
x=78-14
x=66

(24-x)³=64
(24-x)³=4³
24-x=4
x=24-4
x=20