a³/a³+8 ×(a+2/a)³=a³/(a+2)×(a²-2a+4)×(a+2)³/a³=1/a²-2a+4 +(a+2)²=(a+2)²/a²-2a+4=a²+4a+4/a²-2a+4
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a³/a³+8 ×(a+2/a)³=a³/(a+2)×(a²-2a+4)×(a+2)³/a³=1/a²-2a+4 +(a+2)²=(a+2)²/a²-2a+4=a²+4a+4/a²-2a+4