1/a²-3a=1/a(a-3)=(a+3)/a(a+3)(a-3)1/a²-9=1/(a+3)(a-3)=a/a(a+3)(a-3)3/x²-2x=3/x(x-2)=6x+12/2x(x+2)(x-2)2x+1/x²-4=2x+1/(x+2)(x-2)=4x²+2x/2x(x+2)(x-2)3/2x²+4x=3/2x(x+2)=3x-6...