(111+121+131+141)×(121+131+141+151)−(111+121+131+141+151)× (121+131+141)．

Let 111 + 121 + 131 + 141 = a, 121 + 131 + 141 = B, then the original formula = a × (B + 151) - (a + 151) × B = AB + 151a-ab-151b = 151 × (a-b) = 151 × [(111 + 121 + 131 + 141) - (121 + 131 + 141)] = 151 × 111 = 1561;

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