答案
5448
解：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×（1389-842）+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．