1．抛物线的焦点坐标为．2．已知抛物线，则抛物线焦点坐标为.3．若抛物线的焦点到直线的距离为1，则实数的值为．4．已知抛物线的焦点为F，...
1．在中，内角的对边分别为，为钝角，，．(1)求；(2)从条件①、条件②、条件③这三个条件中选择一个作为已知，使得存在，求的面积．条件①...
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