\( A B C D \) a parallelogram, and \( A_{1} \) and \( B_{1} \) are ... VIDEO
\( A B C D \) a parallelogram, and \( A_{1} \) and \( B_{1} \) are the midpoints of sides \( B C \) and \( C D \), respectively. If \( \overrightarrow{A A}_{1}+\overrightarrow{A B}_{1}=\lambda \overrightarrow{A C} \), then \( \lambda \) is equal tohttps://bit.ly/YTAI_PWAP https://www.pw.live
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