123456788×123456790-123456789×123456789,

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123456788×123456790-123456789×123456789,
123456788×123456790-123456789×123456789,

123456788×123456790-123456789×123456789,
(123456789-1)×(123456789+1)-123456789×123456789
=123456789^2-1-123456789^2
=-1