Giúp mik vs ạ xin cảm ơn nhìuuuuuuuuuuuu

`a, -6 xy 1/2 x^2 yz`

`= -6.1/2 . x. x^2 + y.y .z`

`= -6/2 . x^(1+2) . y^(1+1) . z`

`= -3. x^3 . y^2 .z`

`=3x^3 y^2z`

`b, 2/3 y^2 xz . (-1/4) x^2 z`

`= 2/3 . (-1/4) . x. x^2 .y^2 . z. z`

`= -1/6 . x^(1+2) . y^2 . z^(1+1)`

`= -1/6 x^3 . y^2 . z^2`

`= -1/6 x^3 (yz)^2`.