Đáp án + giải thích bước giải :
`b) 1/2 (xy)^2 z . (-3/5) xy^2z`
`= [1/2 . (-3/5)] (x^2 . x) (y^2 . y^2) (z . z)`
`= -3/10 x^3y^4z^2`
Bậc : `9`
`c) x^2y . (-5/4 x^2y) . (2/3x^3 y^4)`
`= (-5/4 . 2/3) (x^2 . x^2 . x^3) (y . y . y^4)`
`= -5/6 x^7 y^6`
Bậc : `13`
`d) -1/2 (xy^2)^3 z^2 . (-3x) (yz)^2 . 2/7 x^2z`
`= -1/2 x^3y^6 z^2 . (-3x) y^2z^2 . 2/7 x^2z`
`= [-1/2 . (-3) . 2/7] (x^3 . x . x^2) (y^6 . y^2) (z^2 . z^2 . z)`
`= 3/7 x^6 y^8 z^5`
Bậc : `19`
