Thực hiện phép tính

Bai 1
a 4x-1/ 3x^2y - 7x-1/ 3x^2y
b 3/ 2x+6 - x-6/ 2x^2+6x
c 1/1-x+2x/x^2-1
d 1/xy-x^2-1/y^2-xy
e 5x+10/4x-8.4-2x/x+2
f 1-4x^2/x^2+4x:2-4x/3x
g 12x/5y^3.15y^4/8x^3
h 4y^2/11x^4.(-3x^2/8y)
i 4x^2/5y^2:6x/5y:2x/3y
k x^2-4/3x+12.x+4/2x-4
m 5x+10/4x-8.4-2x/x+2
n x^2-36/2x+10.3/6-x
o a^2+ab/b-a:a+b/2a^2-2b^2
ô x+y/y-x:x^2+xy/3x^2-3y^2
l 1-4x^2/x^2+4x:2-4x/3x