8*758²-258²*8

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8*758²-258²*8

8*758²-258²*8
8*758²-258²*8

8*758²-258²*8
8×758²-258²×8
=8×(758²-258²)
=8×(758-258)(758+258)
=8×500×1016
=4000×1016
=4064000