原式=908×501-731×1389+（547×236+842×731-495×361）

=908×501-731×1389+547×236+842×731-495×361

=908×501-731×+547×236-495×361

=908×501-731×547+547×236-495×361

=908×501-（731-236）×547-495×361

=908×501-495×547-495×361

=908×501-495×（547+361）

=908×501-495×908

=908×（501-495）

=908×6

=5448．

故本题答案为：5448．