Question

Tìm x:

\(7\cdot2^x=2^9+5\cdot2^8\)

Answer 1

7.2^x = 2^8(2+5)=7.2^8

=>x=8

học tốt

Answer 2

\(7\times2^x=2^9+5\times2^8\)

\(\Rightarrow7\times2^x=2^8\left(2+5\right)\)

\(\Rightarrow7\times2^x=7\times2^8\)

\(\Rightarrow2^x=2^8\)

\(\Rightarrow x=8\)

Answer 3

\(7.2^x=2^9+5.2^8\)

\(7.2^x=512+5.256\)

\(7.2^x=1792\)

\(2^x=1792\div7\)

\(2^x=256\)

\(2^x=2^8\)

\(\Rightarrow x=8\)

Vậy \(x=8\).

Answer 4

\(7.2^x=2^9+5.2^8\)

\(\Rightarrow7.2^x=\left(2+5\right).2^8\)

\(\Rightarrow7.2^x=7.2^8\)

\(\Rightarrow2^x=2^8\)

\(\Rightarrow x=8\)

Vậy x = 8 .

Học tốt nhé

Answer 5

    7. 2^x = 2⁹ + 5. 2⁸ 

<=> 7. 2^x = 2⁸. (2 + 5)

<=> 7. 2^x = 256. 7

<=> 2^x = 256

<=> 2^x = 2⁸

=> x = 8

Vậy x = 8

Answer 6

7.2^x=2^9+5.2^8

7.2^x=512+5.256

7.2^x=512+1280

7.2^x=1792

    2^x=1792:7

    2^x=256

   2^x=2^8

   x=8

vậy x=8

Answer 7

7.2^x = 2^9 + 5.2^8

= 7.2^x = 2^8.( 2 + 5 )

= 7.2^x = 256.7

= 2^x = 256

= 2^x = 2^8

=> x = 8

Hok tốt