Khum vội ạ :333 ngủ sớm đii

Lời giải:

a)

`515:(x+35)=5`

`=>x+35=515:5`

`=>x+35=103`

`=>x=103-35`

`=>x=68`

Vậy `x=68`

b)

`20-2(x+4)=4`

`=>2(x+4)=20-4`

`=>2(x+4)=16`

`=>x+4=16:2`

`=>x+4=8`

`=>x=8-4`

`=>x=4`

Vậy `x=4`

c)

`(10+2x).4^2011=4^2013`

`=>10+2x=4^2013:4^2011`

`=>10+2x=4^2`

`=>10+2x=16`

`=>2x=16-10`

`=>2x=6`

`=>x=6:2`

`=>x=3`

Vậy `x=3`

d)

`12(x-1):3=4^3+2^3`

`=>(12:3).(x-1)=64+8`

`=>4(x-1)=72`

`=>x-1=72:4`

`=>x-1=18`

`=>x=18+1`

`=>x=19`

Vậy `x=19`