Làm giúp mình những phần khoanh đỏ nha

`1)`Câu `e)` sai đề

`3)`

`c)64.4^x=16^8`

`4^3. 4^x=(4^2)^8`

`4^3. 4^x=4^16`

`=>3+x=16`

`=>x=16-3`

`=>x=13`

`4)`

`a)2^x. 4=128`

`2^x. 2^2=2^7`

`=>x+2=7`

`=>x=7-2`

`=>x=5`

`b)(2x+1)^3=125`

`(2x+1)^3=5^3`

`2x+1=5`

`2x=5+1`

`2x=6`

`x=6:2`

`x=3`

`c)2^x-26=6`

`2^x=6+26`

`2^x=32`

`2^x=2^4`

`=>x=4`

`d)64.4^x=4^5`

`4^3. 4^x=4^5`

`=>3+x=5`

`=>x=5-3`

`=>x=2`

`e)27.3^x=243`

`3^3. 3^x=3^5`

`=>3+x=5`

`=>x=5-3`

`=>x=2`

`g)49.7^x=2401`

`7^2. 7^x=7^4`

`=>2+x=4`

`=>x=4-2`

`=>x=2`

`n)3^x+25=26.2^2+2.3^0`

`3^x+25=26.4+2.1`

`3^x+25=106`

`3^x=106-25`

`3^x=81`

`3^x=3^4`

`x=4`