Giải thích các bước giải:

` b) (x + 236 xx 6) : 6 = 536 `

` => x + 236 xx 6 = 536 xx 6 `

` => x + 236 xx 6 = 3216 `

` => x + 236 = 3216 : 6 `

` => x + 236 = 536 `

` => x = 536 - 236 `

` => x = 300 `

Vậy: ` x = 300 `

` b) (x +569 + 987) + 1236 = 20569 `

` => x + 569 + 987 = 20569 - 1236 `

` => x + 569 + 987 = 19333 `

` => x + 569 = 19333 - 987 `

` => x + 569 = 18346 `

` => x = 18346 - 569 `

` => x = 17777 `

Vậy: ` x = 17777 `

` d) (x+5590 : 5 +2369) = 78945 `

` => x+1118 = 78945 - 2369 `

` => x+1118 = 76576 `

` => x = 76576 - 1118 `

` => x = 75458 `

Vậy: ` x = 75458 `

` \color{lightblue}{\text{#Sunny Mery} `

`b) ( x + 236 xx 6 ) : 6 = 536`

 ` ( x + 236 xx 6 ) = 536 xx 6`

`x + 236 xx 6 = 3216`

`x +236 = 3216 : 6`

`x + 236 = 536`

`x = 536 - 236`

`x = 300`

Vậy `x = 300`

`c) ( x + 569 + 987 ) + 1236 = 20569`

`( x + 569 + 987 ) = 20569 - 1236`

`x + 569 + 987 = 19333`

`x + 569 = 19333 - 987`

`x + 569 = 18346`

`x = 18346 - 569`

`x = 17777`

Vậy `x = 17777`

`d) ( x + 5590 : 5 + 2369 ) = 78945`

`( x + 1118 + 2369 ) = 78945`

`x + 1118 = 78945 - 2369`

`x + 1118 = 76576`

`x = 76576 - 1118`

`x = 75458`

Vậy `x = 75458`