Toán PTDTTNT:6x^2-xy-2y^2+3x-2y 2x^2-3xy-2y^2 16/09/2021 By Parker PTDTTNT:6x^2-xy-2y^2+3x-2y 2x^2-3xy-2y^2
$\text { Đáp án: }$ ` 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
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
$\text { Đáp án: }$
` 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) `
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)`