Question

Tìm x thuộc N 

a)  2^x = 4 nhân 128

b)  2^x nhân 3^{x =}4 nhân 9

Answer 1

\(2^x=4.128\Leftrightarrow2^x=512\Leftrightarrow2^x=2^9\Rightarrow x=9\)

\(2^x.3^x=4.9\Rightarrow\left(2.3\right)^x=36\Rightarrow6^x=6^2\Rightarrow x=2\)

Answer 2

9[3 mu x[ 243 

25[ 5 mu x [ 652

9 [ 3 mu n [ 27

25 [ 5 mu h [ 3125

2mu n + 4.2 mu n =5.2 mu5

2 mu n / 4 =16

6.2 mu n + 3.2 mu n = 9.2 mũ n

3 mu n / 3 mu 2 =243