计算9998³-2×9998²-9996/9998³+9998²-9999
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计算9998³-2×9998²-9996/9998³+9998²-9999
计算9998³-2×9998²-9996/9998³+9998²-9999
计算9998³-2×9998²-9996/9998³+9998²-9999
令a=9998,原式可化为
[a³-2a²-(a-2)]/[a³+a²-(a+1)]
=[a²(a-2)-(a-2)]/[a²(a+1)-(a+1)]
=(a²-1)(a-2)/(a²-1)(a+1)
=(a-2)/(a+1)
将a=9998代入
原式=(9998-2)/(9998+1)
=9996/9999
=3332/3333