Đáp án `+` Giải thích các bước giải:

 `A. ( x - 35 ) \times 54 = 0 `

` => x - 35 = 0 : 54 `

` => x - 35 = 0`

` => x = 0 + 35 `

` => x = 35 `

Vậy `x = 35 `

_____________________________________

` B. 39 . ( 35 - x ) = 39 `

` => 35 - x = 39 : 39 `

` => 35 - x = 1`

` => x = 35 - 1 `

` => x = 34`

Vậy `x = 34`

____________________________________

` C. x - 36 : 18 = 12 `

` => x - 2 = 12 `

` => x = 12 + 2`

` => x = 14`

Vậy ` x = 14`

___________________________________

` D. ( x - 36 ) : 18 = 12 `

` => x - 36 = 12 \times 18 `

` => x - 36 = 216 `

` => x = 216 + 36 `

` => x = 252 `

Vậy ` x = 252 `

____________________________________

` E. 345 - ( 15.x + 63 ) = 102 `

` => 15.x + 36 = 345 - 102 `

` => 15.x + 36 = 243 `

` => 15.x = 243 - 63 `

`=> 15.x = 180 `

` => x = 180 : 15 `

` => x = 1 `

Vậy ` x = 12 `

__________________________________

` G. 732 : ( 57 - 135 : x ) = 61 `

` => 57 - 135 : x = 732 : 61 `

` => 57 - 135 : x = 12 `

` => 135 : x = 57 - 12 `

` => 135 : x = 45 `

` => x = 135 : 45 `

` => x = 3 `

Vậy ` x = 3 `

$#linhnguyenngoc0910$

Đáp án $+$ Giải thích các bước giải:

$1.$ Tìm $x,$ biết:

$a)(x-35).54=0$

$⇒x-35=0:54$

$⇒x-35=0$

`⇒x=0+35`

`⇒x=35`

`b)39.(35-x)=39`

`⇒35-x=39:39`

`⇒35-x=1`

`⇒x=35-1`

`⇒x=34`

`c)x-36:18=12`

`⇒x-2=12`

`⇒x=12+2`

`⇒x=14`

`d)(x-36):18=12`

`⇒x-36=12.18`

`⇒x-36=216`

`⇒x=216+36`

`⇒x=252`

`e)345-(15.x+63)=102`

`⇒15.x+63=345-102`

`⇒15.x+63=243`

`⇒15.x=243-63`

`⇒15.x=180`

`⇒x=180:15`

`⇒x=12`

`g)732:(57-135:x)=61`

`⇒57-135:x=732:61`

`⇒57-135:x=12`

`⇒135:x=57-12`

`⇒135:x=45`

`⇒x=135:45`

`⇒x=3`

$@daoquocthai20$