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在\(\vartriangle ABC\)中，点\(M{\rm{ }},{\rm{ }}N\)满足\(\overrightarrow {AM} = 2\overrightarrow {MC} \)，\(\overrightarrow {BN} = \overrightarrow {NC} \)，若\(\overrightarrow {MN} = x\overrightarrow {AB} + y\overrightarrow {AC} \)，则\(x = \)___，\(y = \)___．
参考答案：\(\frac{1}{2}{\rm{ }}\)；\( - \frac{1}{6}\)
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