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

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