`\color{#fcbbbb}{Sai}\color{#fce9bb}{na}\color{#eefcbb} {OvO}` `\color{#c6fcbb}{Hi}\color{#bbfccf}{ma}\color{#bbeefc} {wa}\color{#5cabfa}{ri}``\color{#dca8f7}{(～﹃～)}\color{#ff91d3}{zZ...}`

Đáp án:+Giải thích các bước giải:

`l)`

`x²-12x-64y²+36`

`=(x²-12x+36)-64y²`

`=(x-6)²-(8y)²`

`=(x-6-8y)(x-6-8y)`

`---`

`o)`

`3x²-16x+5`

`=3x²-15x-x+5`

`=3x(x-5)-(x-5)`

`=(x-5)(3x-1)`

`---`

`r)`

`5x³-5x²y-10x²+10xy`

`=(5x³-10x²)-(5x²y-10xy)`

`=(5x²-5xy)(x-2)`

`=x(5x-y)(x-2)`

`---`

`t)`

`x²-y²-10y-25`

`=x²-(y²+10y+25)`

`=x²2-(y+5)²`

`=(x-y-5)(x+y+5)`

`---`

`v)`

`x³+14x²y+49xy²- 1/9 x`

`=x(x²-14xy+49y²)-1/9 x`

`=x(x+7y)²- 1/9 .x`

`=x(x+7y- 1/3)(x+7y + 1/3)`