Cho 6 điểm A, B, C, D, E, F. Chứng minh a) AB+ CD+ BC+ EA = ED b) AB+ BC+ CD+ FE+ DF= AE Giúp mik vs ạ

Giải thích các bước giải:

$a) VT=\overrightarrow{AB}+\overrightarrow{CD}+\overrightarrow{BC}+\overrightarrow{EA}\\
=\overrightarrow{EA}+\overrightarrow{AB}+\overrightarrow{BC}+\overrightarrow{CD}\\
=\overrightarrow{EB}+\overrightarrow{BC}+\overrightarrow{CD}\\
=\overrightarrow{EC}+\overrightarrow{CD}\\
=\overrightarrow{ED}=VP\Rightarrow ĐPCM$

$b) VT=\overrightarrow{AB}+\overrightarrow{BC}+\overrightarrow{CD}+\overrightarrow{FE}+\overrightarrow{DF}\\
=\overrightarrow{AC}+\overrightarrow{CD}+\overrightarrow{FE}+\overrightarrow{DF}\\
=\overrightarrow{AD}+\overrightarrow{FE}+\overrightarrow{DF}\\
=\overrightarrow{AD}+\overrightarrow{DF}+\overrightarrow{FE}\\
=\overrightarrow{AF}+\overrightarrow{FE}\\
=\overrightarrow{AE}=VP\Rightarrow ĐPCM$