如图,在\(\triangle ABC\)中,\(AB=2\),\(BC=3\),\(∠ABC=60^{\circ}\),\(AH⊥BC\)于点\(H\),\(M\)为\(AH\)的中点\(.\)若\(\overrightarrow{AM} =λ\overrightarrow{AB} +μ\overrightarrow{BC} \),则\(λ+μ=\)________.
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