在平面直角坐标系xOy中,点A(-1,-2)、B(2,3)、C(-2,-1).
(1)求以线段AB、AC为邻边的平行四边形两条对角线的长;
(2)设实数t满足(
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)•
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224259217378186/SYS201311012242592173781018_ST/1.png)
=0,求t的值.
考点分析:
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