Question

Thực hiện phép tính:
a,4.(x+3)/3x²-x : x²+3x/1-3x

b, x+1/x²-2x-8 . 4-x/x²+x
c, 9x+5/2(x-1)(x+3)²- 5x-7/2(x-1)(x+3)²
d, 18/(x-3)(x²-9)-3/x^2-6x+9-x/x^2-9

e, 1/x²-x+1+1/1-x²+2/x³+1