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(1234567891)2-1234567890×1234567892=______.
人气:121 ℃ 时间:2020-02-06 01:28:24
解答
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.
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