1.在ΔABC\Delta ABCΔABC中,点MMM在线段BCBCBC上,AN→=23AM→=λAB→+μAC→\overrightarrow{AN}=\frac{2}{3}\overrightarrow{AM}=\lambda \overrightarrow{AB}+\mu \overrightarrow{AC}AN=32AM=λAB+μAC,则λ+μ=(\lambda +\mu =(λ+μ=( )))