(x+y)a-(x-y)a 化简~
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(x+y)a-(x-y)a化简~(x+y)a-(x-y)a化简~(x+y)a-(x-y)a化简~(x+y)a-(x-y)a=ax+ay-ax+ay=2ay2ay(x+y)a-(x-y)a=a(x+y-
(x+y)a-(x-y)a 化简~
(x+y)a-(x-y)a 化简~
(x+y)a-(x-y)a 化简~
(x+y)a-(x-y)a
=ax+ay-ax+ay
=2ay
2ay
(x+y)a-(x-y)a
=a(x+y-x+y)
=2ya
1、由X Y=3A 7,X-Y=5A 1解得X=4A 4,Y=-A 3 因为解均为正数,所以4A 4
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