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数学
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用简便方法计算:1-2+3-4+5-6+.-100+101
人气:131 ℃ 时间:2019-10-10 01:17:49
解答
=(1+101)*51/2-(2+100)*50/2
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巧算:1-2+3-4+5-6+…-98+99-100+101.
(1+3+5+7+9+.+101)-(2+4+6+8+.+100)用简便方法计算...
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递等式计算 1-2+3-4+5-6.+99-100+101 这道题有谁能把简便方法的步骤清楚地写下来!
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