PTDTTNT:6x^2-xy-2y^2+3x-2y 2x^2-3xy-2y^2

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1. $\text { Đáp án: }$

   ` 6x² – xy – 2y² + 3x – 2y `

   ` = 6x² – 4xy + 2xy – 2y² + 3x – 2y `

   ` = 2x(3x – 2y) + y(3x – 2y) + (3x – 2y) `

   ` = (2x + y + 1)(3x – 2y) `

   ` 2x² – 3xy – 2y² `

   ` = 2x² + xy – 4xy – 2y² `

   ` = x(2x + y) – 2y(2x + y) `

   ` = (2x + y)(x – 2y) `

   Trả lời

2. a)

   `6x^2-xy-2y^2+3x-2y `

   `⇔6x^2-4xy+3xy-2y^2+3x-2y`

   `⇔2x(3x-2y)+y(3x-2y)+(3x-2y)`

   `⇔(2x+y+1)(3x-2y)`

   b)

   `2x^2-3xy-2y^2`

   `⇔2x^2+xy-4xy-2y^2`

   `⇔x(2x+y)-2y(2x+y)`

   `⇔(x-2y)(2x+y)`

    

   Trả lời