\(已知:BC=4,\angle A =45^\circ,求解:AB+\frac{\sqrt{2}}{2}AC最大值。\) 2025-06-302025-06-30 易林 \(已知:BC=4,\angle A =45^\circ\), \(求解:AB+\frac{\sqrt{2}}{2}AC最大值。\)