Đáp án:
$1/$
$a/$ `1/2x^2 (-2x^2y^2 z) (-1)/3 x^2y^2`
`= [1/2 . (-2) . (-1/3)] (x^2 . x^2 . x^2) (y^2 . y^2) z`
`= 1/3 x^6 y^4 z`
Bậc: `11`
$b/$ `(-x^2y)^3 . 1/2 x^2y^3 . (-2xy^2z)^2`
`= -1 x^6 y^3 . 1/2 x^2y^3 . 4 x^2y^4z^2`
`= (-1 . 1/2 . 4) (x^6 . x^2 . x^2) (y^3 . y^3 . y^4) z^2`
`= -2 x^{10} y^{10} z^2`
Bâc : `22`
$2/$
$a/$ `(-6x^3 zy) (2/3 yx^2)^2`
`= -6x^3zy . 4/9 y^2 x^4`
`= (-6 . 4/9) (x^3 . x^4) (y^2 . y) z`
`= -8/3 x^7 y^3 z`
Bậc : `11`
$b/$ `(xy - 5x^2y^2 + xy^2 - xy^2) - (x^2y^2 + 3xy^2 - 9x^2y)`
`= xy - 5x^2y^2 + xy^2 - xy^2 - x^2y^2 - 3xy^2 + 9x^2y`
`= xy + (-5x^2y^2 - x^2y^2) + (xy^2 - xy^2 - 3xy^2) + 9x^2y`
`= xy - 6x^2y^2 - 3xy^2 + 9x^2y`
$3/$
$a/$ `2x^2 + 3x^2 - 7x^2`
`= (2 + 3 - 7) x^2`
`= -2 x^2`
$b/$ `5xy - 1/3 xy + xy`
`= (5 - 1/3 + 1) xy`
`= 17/3xy`
$c/$ `15xy^2 - (-5xy^2)`
`= 15 xy^2 + 5xy^2`
`= 20xy^2`
