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数学
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1+2-3+4-5+…-99+100=______.
人气:445 ℃ 时间:2019-10-08 23:51:01
解答
1+2-3+4-5+…-99+100,
=1-[(3-2)+(5-4)+…+(99-98)]+100,
=1-[1×49]+100,
=1-49+100,
=52;
故答案为:52.
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