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1+2+3-4-5-6+7+8+9-10-11-12+……+2031-2032-2033-2034=?
题目详情
1+2+3-4-5-6+7+8+9-10-11-12+……+2031-2032-2033-2034=?
▼优质解答
答案和解析
原式=(1+2+3-4-5-6)+(7+8+9-10-11-12)+……+(2029+2030+2031-2032-2033-2034)
=-9-9-9-.-9
=-9×339
=-3051
=-9-9-9-.-9
=-9×339
=-3051
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