`a_1`
`7x^2 y^3 + 8x^2 y^3 - 2x^2 y^3 + M = 10x^2 y^3`
`=> M = 10x^2 y^3 - (7x^2 y^3 + 8x^2 y^3 - 2x^2 y^3)`
`=> M = 10x^2 y^3 - 7x^2 y^3 - 8x^2 y^3 + 2 x^2 y^3`
`=> M = -3 x^2 y^3`
Vậy `M = -3x^2y^3`
`a_2`
`7/2 x^3 y^3 - M = 2/3 x^3 y^5 - 2 x^3 y^5`
`=> M = 7/2x^3 y^3 - (2/3 x^3 y^5 - 2 x^3 y^5)`
`=> M = 7/2 x^3 y^3 - 4/3 x^3 y^5`
Vậy `M = 7/2 x^3 y^3 - 4/3 x^3 y^5`
``
`7/2 x^3 y^5 - M = 2/3 x^3 y^5 - 2 x^3 y^5`
`=> M = 7/2x^3 y^5 - (2/3 x^3 y^5 - 2 x^3 y^5)`
`=> M = 7/2 x^3 y^5 - 2/3 x^3 y^5 + 2 x^3 y^5`
`=> M = 29/6 x^3 y^5`
Vậy `M = 29/6 x^3 y^5`
`a_3`
`M- (7/3 x^2 y^5 - 5/2 x^2 y^5) - 2/3 x^2 y^5 = - x^2 y^5`
`=> M = - x^2 y^5 + 2/3 x^2 y^5 + (7/3 x^2 y^5 - 5/2 x^2 y^5)`
`=> M = - x^2 y^5 + 2/3 x^2 y^5 + 7/3 x^2 y^5 - 5/2 x^2 y^5`
`=> M = -1/2 x^2 y^5`
Vậy `M = -1/2 x^2 y^5`
`a_4`
`-4/3 x^2 y^7 - 5/2 x^2 y^7 - 4x^2 y^7 = 2/3 x^2 y^7 - M`
`=> M = 2/3 x^2 y^7 - (-4/3 x^2 y^7 - 5/2 x^2 y^7 - 4x^2 y^7)`
`=> M = 2/3 x^2 y^7 + 4/3 x^2 y^7 + 5/2 x^2 y^7 + 4 x^2 y^7`
`=> M = 17/2 x^2 y^7`
Vậy `M = 17/2 x^2 y^7`
