Question

2.Tìm m thuộc N
a)2.16> hoặc bằng2^m>4
b)9.27<hoặc bằng3^m<hoặc bằng 243

Answer 1

`a, 2.16 >= 2^m > 4`

`2^5 >= 2^m > 2^2`

`=> m =5,4,3`

`b, 9.27 <= 3^m <= 243`

`3^5 <= 3^m <= 3^5`

`=> m = 5`.

Answer 2

a) \(2.16\ge2^m>4\)

\(\Rightarrow2^5\ge2^m>2^2\)

\(\Rightarrow m=\left\{5;4;3\right\}\)

b) \(9.27\le3^m\le243\)

\(\Rightarrow3^5\le3^m\le3^5\)

\(\Rightarrow m=5\)