求答,填空题,13.14.15.16题,

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求答,填空题,13.14.15.16题,
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求答,填空题,13.14.15.16题,
求答,填空题,13.14.15.16题,
 

求答,填空题,13.14.15.16题,
13.-15 14.0 15.4,-2 16.X=2,Y=1或X=-2,Y=-1或X=-2,Y=1或X=2,Y=-1