Question

a.3^x=9

b. 4^x=64

c.2^x=16

d.9^x-1=9

e.x^4=16

f.2^x:2^5=1  

minh can cap

Answer 1

`3^x=9`

`=>3^x=3^2`

`=>x=2`

`--------`

`4^x=64`

`=>4^x= 4^3`

`=>x=3`

`--------`

`2^x=16`

`=>2^x= 2^4`

`=>x=4`

`---------`

ko rõ đề lắm

`-------`

`x^4=16`

`=>2^4=16`

`=>x=4`

`-------`

`2^x:2^5=1`

`=>2^x : 32 =1`

`=>2^x=32`

`=>2^x= 2^5`

`=>x=5`

Answer 2

\(a,3^x=9\Rightarrow3^x=3^2\Rightarrow x=2\)

\(b,4^x=64\Rightarrow4^x=4^3\Rightarrow x=3\)

\(c,2^x=16\Rightarrow2^x=2^4\Rightarrow x=4\)

\(d,9^{x-1}=9\Rightarrow9^{x-1}=9^1\Rightarrow x-1=1\Rightarrow x=2\)

\(e,x^4=16\Rightarrow x^4=2^4\Rightarrow x=2\)

\(f,2^x:2^5=1\Rightarrow x:5=1\Rightarrow x=5\)