Cứu với mọi ng-🫵

`1. `

`A=(5x^3y^2-3x^2y+xy):(xy)`

`=5x^2y-3x+1`

`2. `

`A+2M=P<=>A=P-2M=3x^3-2x^2y-xy+3-2(x^3-x^2y+2xy+3)`

`=3x^3-2x^2y-xy+3-2x^3+2x^2y-4xy-6`

`=3x^3-2x^3-xy-4xy-2x^2y+2x^2y+3-6`

`=x^3-5xy-3`

`3. `

Thay `x=2/3` vào `N`, ta có:

`9. (2/3)^2-12. 2/3+4`

`=4-8+4`

`=0`

Vậy `...`