Question

21+3^x-2=48

hẹp mi

Answer 1

21+3x−2=48

=>3�−2=48−21=>3x−2=48−21

=>3�−2=27=33=>3x−2=27=33

$=>x-2=3$

$=>x=5$

 

Answer 2

\(21+3^{x-2}=48\\ \Rightarrow3^{x-2}=27\\ \Rightarrow3^{x-2}=3^3\\ \Rightarrow x-2=3\\ \Rightarrow x=5.\)

Answer 3

thank you các bẹn

Answer 4

3^x-1=48-21

3^x:3=27

3^x=3x27

3^x=81

3^x=3^4

x=4

 

Answer 5

sửa thành 3^x-2 nhé nìn nhầm

 

Answer 6

21+3^x-2=48

3^x-2=48-21

3^x-2=27

3^x-2=3^3

suy ra:x-2=3

         x    =3+2

       x=5

Vậy x=5