aaaaaaaaaaaaaaaaaaaaaaaa

Đáp án + Giải thích các bước giải:

`1.` 

`a)` `16` `-` `x²` `-` `y²` `+` `2xy`

`=` `16` `-` `x²` `+` `2xy` `-` `y²` 

`=` `16` `-` `( x² - 2xy + y² )`

`=` `16` `-` `( x - y )²`

`=` `4²` `-` `( x - y )²` 

`=` `[ 4 - ( x - y ]``[ 4 + x - y ]`

`=` `( 4 - x + y )``( 4 + x - y )` 

`b)` `3x³` `-` `6x²y` `+` `3xy³` 

`=` `3x``( x² - 2xy + y³ )` 

`2.` 

`6x``( x - 5 )` `-` `( 2x - 1 )``( 2x + 1 )` `=` `2x²` `+` `7` 

`6x²` `-` `30x` `-` `( 4x² + 2x - 2x - 1 )` `=` `2x²` `+` `7`

`6x²` `-` `30x` `-` `4x²` `-` `2x` `+` `2x` `+` `1` `=` `2x²` `+` `7`

`6x²` `-` `4x²` `-` `2x²` `-` `30x` `=` `7` `-` `1`

`-30x` `=` `6`

`x`      `=` `-\frac{6}{30}`

`x`      `=` `-\frac{1}{5}` 

Vậy `x` `=` `-\frac{1}{5}` 

`tt(#TuHoan)` 

mik gửi aa ^^

\begin{array}{c}\color{#A61123}{\texttt{˚𝜗}}\color{#C92A3E}{\texttt{L}}\color{#EAE3D2}{\texttt{i}}\color{#F5EFE6}{\texttt{L}}\color{#363B59}{\texttt{i}}\color{#1B2238}{\texttt{u}}\color{#0F1424}{\texttt{m}}\color{#070A12}{\texttt{𝜚˚}}\end{array}