Question

1 tìm số tự nhiên x biết 

2^x+3+2^x=144

Answer 1

2^x+3+2^x=144

2^x.(2³+1)=144

2^x.9=144

2^x = 144:9

2^x=2⁴

=> x=4

Answer 2

\(2^x.2^3+2^x.1=144\)

\(2^x.\left(2^3+1\right)=144\)

\(2^x.9=144\)

\(2^x=144:9\)

\(2^x=16\)

\(2^x=2^4\)

Vậy x=4

Answer 3

\(2^{x+3}+2^x=144\)

\(=>2^x\left(2^3+1\right)=144\)

\(=>2^x.9=144\)

\(=>2^x=2^4=>x=4\)