如图,在正方形ABCD中AC与BD交于点O,形外有一点E,使∠AED=90°,且DE=3,OE=,则AE= .
计算:(1)(-) (2)| | + || +
(本题16分)计算:(1) (2) (3) -14×(-2)+(-5)×2+4× (4)
计算:(1) (2) (3) (4)
计算: