Question

Tim so tu nhien x biet

5 × ( 7 + 48 : x ) = 45

5^2x-3 - 2 × 5² = 5² × 3

Answer 1

5.(7+48:x)=45

(7+48:x)=45:5

(7+48:x)=9

48:x=9-7

48:x=2

x=48:2

x=24

Answer 2

(7+48:x)=45:5

7+(48:x)=9

48:x=9-7

48:x=2

x=2*48

x=96

Answer 3

a.5 × ( 7 + 48 : x ) = 45

( 7 + 48 : x ) = 45 : 5 

 7 + 48 : x  = 9

48 : x = 9 - 7

48 : x = 2

x = 48 : 2 

x = 24

b. 5^{2x - 3}  - 2 × 5² = 5² × 3

5^2x-3 = 5^2 × 3 + 2 × 5^2

5^2x-3 = 5^2 × ( 2 + 3 )

5^2x-3 = 5^2 . 5

5^2x-3 = 5^3 

=> 2x - 3 = 3

=> 2x = 6

=> x = 3 

Answer 4

5 x ( 7 + 48 : x ) = 45

=> ( 7 + 48 : x ) = 45 : 5 = 9

=> 48 : x = 9 - 7 = 2

=> x = 48 : 2 = 24