Bài 2 tìm x a,4.(7x-3)=4mũ3+2mũ3 b,(24+5/x-1/).7mũ3=7mũ5 c,/x-5/=3 d,2mũ x=16

Giải thích các bước giải:

`a)`
`4.(7x-3)=4^3+2^3`
`=>4.(7x-3)=64+8`
`=>4.(7x-3)=72`
`=>7x-3=18`
`=>7x=21`
`=>x=21:7`
`=>x=3`
`b)`
`(24+5|x-1|).7^3=7^5`
`=>(24+5|x-1|)=7^2`
`=>(24+5|x-1|)=49`
`=>5|x-1|=25`
`=>|x-1|=25:5`
`=>|x-1|=5`
`=>`\(\left[ \begin{array}{l}x-1=5\\x-1=-5\end{array} \right.\) 
`=>`\(\left[ \begin{array}{l}x=6\\x=-4\end{array} \right.\) 
`c)`
`|x-5|=3`
`=>`\(\left[ \begin{array}{l}x-5=3\\x-5=-3\end{array} \right.\) 
`=>`\(\left[ \begin{array}{l}x=3+5\\x=-3+5\end{array} \right.\) 
`=>`\(\left[ \begin{array}{l}x=8\\x=2\end{array} \right.\) 
`d)`
`2^x=16`
`=>2^x=2^4`
`=>x=4`