x^2-3x-4y^2+6y x^2-25y^2-6x+9 x^2-x+3-3x

0 bình luận về “x^2-3x-4y^2+6y x^2-25y^2-6x+9 x^2-x+3-3x”

1. `1, x^2-3x-4y^2+6y`

   `=(x^2-4y^2)-(3x-6y)`

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

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

   `2, x^2-25y^2-6x+9`

   `=(x^2-6x+9)-25y^2`

   `=(x-3)^2-(5y)^2`

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

   `3, x^2-x+3-3x`

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

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

   Bình luận