问题
解答题
12345678982-1234567897×1234567899.
答案
设1234567898=a,则:
12345678982-1234567897×1234567899,
=a2-(a-1)×(a+1),
=a2-(a2-1),
=a2-a2+1,
=1.
12345678982-1234567897×1234567899.
设1234567898=a,则:
12345678982-1234567897×1234567899,
=a2-(a-1)×(a+1),
=a2-(a2-1),
=a2-a2+1,
=1.