~ $\text{ Làm lun câu 6, 7, 8 câu 1 tặng bn nè !! }$ ~

$\text{ Câu 1 : }$

$\text{ 6) -144 - [ 29 - ( -144 ) -144 ] }$

$\text{ = -144 - [ 29 + 144 - 144 ] }$

$\text{ = -144 - [ 29 + ( 144 - 144 ) ] }$

$\text{ = -144 - [ 29 + 0 ] }$

$\text{ = -144 - 29 }$

$\text{ = -173 }$

$\text{ 7) ( -145 ) - ( 18 - 145 ) }$

$\text{ = -145 - 18 + 145 }$

$\text{ = ( -145 + 145 ) - 18 }$

$\text{ = 0 - 18 }$

$\text{ = -18 }$

$\text{ 8) 271 - [( -43 ) + 271 - ( -117 )] }$

$\text{ = 271 - [ -43 + 271 + 117 ] }$

$\text{ = 271 + 43 - 271 - 117 }$

$\text{ = ( 271 - 271 ) + ( 43 - 117 ) }$

$\text{ = 0 + ( -74 ) }$

$\text{ = -74 }$

$\text{ Câu 3 : }$

$\text{ 1) 46 + ( x - 45 ) = 987 }$

$\Rightarrow$ $\text{ 46 + x - 45 = 987 }$

$\Rightarrow$ $\text{ x + ( 46 - 45 ) = 987 }$

$\Rightarrow$ $\text{ x + 1 = 987 }$

$\Rightarrow$ $\text{   x     = 987 - 1 }$

$\Rightarrow$ $\text{   x     = 986 }$

  $\text{ Vậy x = 986 }$

$\text{ 2) ( -562 ) - ( x - 562 ) = 0 }$

$\Rightarrow$ $\text{ -562 - x + 562 = 0 }$

$\Rightarrow$ $\text{ ( -562 + 562 ) - x = 0 }$

$\Rightarrow$ $\text{ 0 - x  = 0 }$

$\Rightarrow$ $\text{   x     = 0 }$

  $\text{ Vậy x = 0 }$

$\text{ 3) 11 - ( -53 + x ) = 97 }$

$\Rightarrow$ $\text{ 11 + 53 + x = 97 }$

$\Rightarrow$ $\text{ 64 + x = 97 }$

$\Rightarrow$ $\text{     x     = 97 - 64 }$

$\Rightarrow$ $\text{     x     = 33 }$

  $\text{ Vậy x = 33 }$

$\text{ 4) ( 25 + x ) - 25 = 0 }$

$\Rightarrow$ $\text{ 25 + x - 25 = 0 }$

$\Rightarrow$ $\text{ ( 25 - 25 ) + x = 0 }$

$\Rightarrow$ $\text{      0 + x         = 0 }$

$\Rightarrow$ $\text{          x            = 0 }$

    $\text{ Vậy x = 0 }$

$\text{ 5) -( x + 84 ) + 213 = ( -16 ) }$

$\Rightarrow$ $\text{ -x - 84 + 213 = -16 }$

$\Rightarrow$ $\text{ 213 - 84 - x = -16 }$

$\Rightarrow$ $\text{    129 - x     = -16 }$

$\Rightarrow$ $\text{         x          = 129 - ( -16 ) }$

$\Rightarrow$ $\text{         x          = 145 }$

            $\text{ Vậy x = 145 }$

$\text{ 6) x - ( -10 ) = 5 }$

$\Rightarrow$ $\text{ x + 10 = 5 }$

$\Rightarrow$ $\text{ x = 5 - 10 }$

$\Rightarrow$ $\text{ x = -5 }$

  $\text{ Vậy x = -5 }$

$\text{ 7) 5 - ( -x ) + 1 = ( -4 ) }$

$\Rightarrow$ $\text{ 5 + x + 1 = -4 }$

$\Rightarrow$ $\text{ 6 + x = -4 }$

$\Rightarrow$ $\text{ x = -4 - 6 }$

$\Rightarrow$ $\text{ x = -10 }$

  $\text{ Vậy x = -10 }$

$\text{ 8) ( -x ) + 4 = ( -20 ) }$

$\Rightarrow$ $\text{ 4 - x = -20 }$

$\Rightarrow$ $\text{ x = 4 - ( -20 ) }$

$\Rightarrow$ $\text{ x = 4 + 20 }$

$\Rightarrow$ $\text{ x = 24 }$

  $\text{ Vậy x = 24 }$

Đáp án:

Giải thích các bước giải:

CHO MÌNH 5 VOTE NHÉ! 

CHỌN CÂU TRẢ LỜI CỦA MÌNH LÀ CÂU TRẢ LỜI HAY NHẤT NHÉ! 

CHÚC BẠN HỌC TỐT!