Question

giúp em với ạ:))

Answer 1

Xét ΔABC có \(\dfrac{AC}{sinB}=\dfrac{AB}{sinC}\)

=>\(\dfrac{AC}{sin60}=\dfrac{5}{sin45}=5:\dfrac{\sqrt{2}}{2}=5\sqrt{2}\)

=>\(AC=5\sqrt{2}\cdot\dfrac{\sqrt{3}}{2}=\dfrac{5\sqrt{6}}{2}\)

=>Chọn A