(1234567891)2-1234567890×1234567892=_.
问题描述:
(1234567891)2-1234567890×1234567892=______.
答
设a=1234567891,则:
(1234567891)2-1234567890×1234567892
=a2-(a-1)×(a+1)
=a2-(a2-1)
=a2-a2+1
=1
故答案为:1.