20092008²/(20092009²+20092007²-2)
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/14 09:41:31
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20092008²/(20092009²+20092007²-2)
20092008²/(20092009²+20092007²-2)
20092008²/(20092009²+20092007²-2)
20092008²/(20092009²+20092007²-2)
=20092008²/((20092008+1)²+(20092008-1)²-2)
=20092008²/(20092008²+2*20092008²*1+1²+20092008²-2*20092008²*1+1²-2)
=20092008²/(2*20092008²)
=1/2