(x²-4分之x²+x+1)²÷(x三次方-3x²+2x÷x三次方)²×(x÷x+2)² ,

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(x²-4分之x²+x+1)²÷(x三次方-3x²+2x÷x三次方)²×(x÷x+2)² ,

(x²-4分之x²+x+1)²÷(x三次方-3x²+2x÷x三次方)²×(x÷x+2)² ,
(x²-4分之x²+x+1)²÷(x三次方-3x²+2x÷x三次方)²×(x÷x+2)² ,

(x²-4分之x²+x+1)²÷(x三次方-3x²+2x÷x三次方)²×(x÷x+2)² ,
[(x²-4)/(x²+x+1)]²÷[(x³-3x²+2x)÷x³]²×[x÷(x+2)]²
=[(x²-4)/(x²+x+1)]²÷[(x²-3x+2)÷x²]²×[x÷(x+2)]²
=[(x²-4)/(x²+x+1)]²×[x²/(x²-3x+2)]²×[x÷(x+2)]²
=[(x+2)(x-2)/(x²+x+1)×x²/(x-2)(x-1)×x/(x+2)]²
=[x³/(x²+x+1)(x-1)]²
=[x³/(x³-1)]²