Rút gọn: 2x - 1/x^3 + 1 + 2x/x^2 - x + 1 + -x/x + 1 + 2

Rút gọn :
a) 2x-1 / x^3+1 + 2x / x^2-x+1 + -x / x+1 + 2
b) x+1 / 2x-2 + x^2+3 / 2-2x^2 + 1 / 1-x - 1,5
c) (x / xy-y^2 + 2x-y / xy-x^2) : x^2-2xy+y^2 / x^2y-xy^2
d) (x^2 / x^3-4x - 6 / 3x-6 + 1 / x+2) . x+2 / 6
e) (1 / (2x-y)^2 + 2 / 4x^2-y^2 - 1 / (2x+y)^2) . x^2+4xy+y^2 / 16x
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