. / funny / Kai / little / but / quiet, / is a / very

\(\to\) Kai is a very funny but quiet little.

''Might goes'' thành ''might go''

Sau ''might'' là V_inf

a) `3^3 .2^n =432`

`=>27.2^n =432`

`=>2^n =432:27`

`=>2^n =16`

`=>2^n =2^4`

`=>n=4`

b) `784:7^n =2^4`

`=>7^n =784:16`

`=>7^n =49`

`=>7^n =7^2`

`=>n=2`

c) `9<3^n :3<81`

`=>3^2 .3<3^n <3^4 .3`

`=>3^3 <3^n <3^5`

`=>n=4`

d) `2.3^n =6.3^7`

`=>3^n =6:2.3^7`

`=>3^n =3.3^7`

`=>3^n =3^8`

`=>n=8`

e) `3^4 .3^n =9^3`

`=>3^4 .3^n =3^6`

`=>3^n =3^6 :3^4`

`=>3^n =3^2`

`=>n=2`

f) `2^(n+2)-2^n =96`

`=>2^n .2^2 -2^n =96`

`=>2^n .(4-1)=96`

`=>2^n .3=96`

`=>2^n =96:3`

`=>2^n =32`

`=>2^n =2^5`

`=>n=5`

`[195-(3x-27)].39=4212`

`=>195-(3x-27)=4212:39`

`=>195-(3x-27)=108`

`=>3x-27=195-108`

`=>3x-27=87`

`=>3x=87+27`

`=>3x=114`

`=>x=114:3`

`=>x=38`

`53.(9-x)=53`

`=>9-x=53:53`

`=>9-x=1`

`=>x=9-1`

`=>x=8`