`1)x.(x+2)-3.(x+2)`
`=(x+2).(x-3)`
`2)2x.(x-5)+5-x`
`=2x.(x-5)+(5-x)`
`=2x.(x-5)-(x-5)`
`=(x-5).(2x-1)`
`3)3x.(x-2)+5.(x-2)`
`=(x-2).(3x+5)`
`4)7x^2.(y+3)-14x.(3+y)`
`=7x^2.(y+3)-14x.(y+3)`
`=(y+3).(7x^2-14x)`
`=7x.(y+3).(x-2)`
`5)10x^2.(x-y)+15x^3.(y-x)`
`=10x^2.(x-y)-15x^3.(x-y)`
`=(x-y).(10x^2-15x^3)`
`=5x^2.(x-y).(2-3x)`
`6)5x.(2x-3y)-15.(3y-2x)`
`=5x.(2x-3y)+15.(2x-3y)`
`=(2x-3y).(5x+15)`
`=5.(2x-3y).(x+3)`
mk gửi nha~
$#chúc tus học tốt!!$
