Các bạn giúp mik với:Tính các PTĐS
1. 4x^2y/3xy^2 - 6xy/3x^2y
2. 2(x-1)/3+x + 5x/3+x
3. 2-1/4+2x - (x+5)
4. x/x^2-36 - x-6/x^2+6x
5. 5x^2+6x/3-3x^2 + x+1/x-1 + x/x+1
6. 3x-1/4x+2 - 5x+3/4x+2
7. x+2y/x-3y + 5y/3y-x - 2xy
8. 2xy/x^2-y^2 + x-y/2x+2y
9. 1/2^2y - 3/5x + 2/4x^2y^3
10. x-1/2x-1 + 3x+5/1-2x - 3x+1/2x-1