Question

xin mn giúp mình

------------------------------

Answer 1

số lớn thế;-;

Answer 2

cô mik giao

Answer 3

`2)a)5^(x+2)+5^(x+1)+5^x+225=1000`

`=>5^(x+2)+5^(x+1)+5^x=1000-225`

`=>5^x . 5^2+5^x . 5^1+5^x . 1=775`

`=>5^x .(25 + 5 + 1)=775`

`=>5^x .31==775`

`=>5^x=775:31`

`=>5^x=25`

`=>5^x=5^2` 

`=>x=2`