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a)x/2x-3 + 2x-3/4x²-9
x(2x+3)/(2x-3)(2x+3) + 2x-3/4x²-9=
(2x²+3x+2x-3)/(2x-3)(2x+3)=(2x²+5x-3)/(4x²-9)
b)2- x-4/3-x²
2(3-x²)/(3-x²) - (x-4)/(3-x²)=
(6-2x²-x+4)/(3-x²)=(-2x²-x+10)/(3-x²)
c) x³-1/x³+8 - x-2/x²-2x+4 + 2/x+2
x³-1/(x+2)(x²-2x+4) - x-2/x²-2x+4 + 2/x+2=
x³-1/(x+2)(x²-2x+4) - (x-2)(x+2)/(x²-2x+4)(x+2) + 2(x²-2x+4)/(x+2)(x²-2x+4)=
(x³-1)/(x+2)(x²-2x+4) - (x²-4)/(x²-2x+4)(x+2) + (2x²-4x+8)/(x+2)(x²-2x+4)=
(x³-1-x²+4+2x²-4x+8)/(x+2)(x²-2x+4)=(x³+x²-4x+11)/(x+2)(x²-2x+4)
d)x-2/x+2 * x²+4x+4/x+4
x-2/x+2 * (x+2)²/x+4=
(x-2) * (x+2)/x+4=(x²-4)/(x+4)