Làm giúp mik 3 câu dưới với

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`a, [8(x+2y)^5 - 10(x+2y)^6]:3(-x-2y)^2`

`= [8(x+2y)^5 - 10(x+2y)^6]:3(x+2y)^2`

`= 8(x+2y)^5 : 3(x+2y)^2 - 10(x+2y)^6 : 3(x+2y)^2`

`= 8/3(x+2y)^3 - 10/3(x+2y)^4`

`b, [3(2x-4y)^3 - 8(2y-x)^4] : (4y^2 - 4xy + x^2)`

`= [-6(2y-x)^3 - 8(2y-x)^4] : (2y-x)^2`

`= -6(2y-x)^3 : (2y-x)^2 - 8(2y-x)^4 : (2y-x)^2`

`= -6(2y-x) - 8(2y-x)^2`

`= -12y+6x - 8(4y^2 - 4xy + x^2)`

`= -12y + 6x - 32y^2 + 32xy - 8x^2`

`c, (64x^3 + y^3):(8x+2y)`

`= (4x+y)(16x^2 - 4xy + y^3) : 2(4x+y)`

`= (16x^2 - 4xy + y^3) : 2`

`= 8x^2 - 2xy + 1/2y^3`