如图，已知AB∥CD，EF∥BP，MN∥DP，求∠1+∠E+∠F+∠3+∠M+∠N+∠2的度数．

点P作PG∥AB，∵AB∥CD，∴AB∥CD∥PG，∴∠1+∠FBP+∠EPG+∠EPB=180°，∠GPN+∠NPD+∠PDM+∠2=180°，∵EF∥BP，∴∠FBP=∠F，∠EPB=∠E，∴∠1+∠F+∠EPG+∠E=180°①，∵MN∥DP，∴∠NPD=∠N，∠PDM=∠M，∴∠GP...