问题 解答题

计算:98766×98768-98765×98769.

答案

98766×98768-98765×98769,

=(98765+1)×98768-98765×(98768+1),

=98765×98768+98768-(98765×98768+98765),

=98765×98768+98768-98765×98768-98765,

=98768-98765,

=3.

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