7.2^x = 2^8(2+5)=7.2^8
=>x=8
học tốt
\(7\times2^x=2^9+5\times2^8\)
\(\Rightarrow7\times2^x=2^8\left(2+5\right)\)
\(\Rightarrow7\times2^x=7\times2^8\)
\(\Rightarrow2^x=2^8\)
\(\Rightarrow x=8\)
\(7.2^x=2^9+5.2^8\)
\(7.2^x=512+5.256\)
\(7.2^x=1792\)
\(2^x=1792\div7\)
\(2^x=256\)
\(2^x=2^8\)
\(\Rightarrow x=8\)
Vậy \(x=8\).
\(7.2^x=2^9+5.2^8\)
\(\Rightarrow7.2^x=\left(2+5\right).2^8\)
\(\Rightarrow7.2^x=7.2^8\)
\(\Rightarrow2^x=2^8\)
\(\Rightarrow x=8\)
Vậy x = 8 .
Học tốt nhé
7. 2x = 29 + 5. 28
<=> 7. 2x = 28. (2 + 5)
<=> 7. 2x = 256. 7
<=> 2x = 256
<=> 2x = 28
=> x = 8
Vậy x = 8
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
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
