125+126+127+128+······+221+222+223等于多少怎样算？
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125+126+127+128+······+221+222+223等于多少怎样算？125+126+127+128+······+221+222+223等于多少怎样算？125+126+127+128+
125+126+127+128+······+221+222+223等于多少怎样算？
125+126+127+128+······+221+222+223等于多少
怎样算？
125+126+127+128+······+221+222+223等于多少怎样算？
原式=[（125+223）*98] \2 =17052
223-125=98 223+128=361 361*98=35378
速度采纳....97%的正确
运用高斯公式：（首项＋末项）×项数÷2
125+126+127+128+······+221+222+223
＝（125＋223）×（223－125＋1）÷2
＝348×99÷2
＝17226
这里的项数是要加1的，如1,2，3....10,一共10个数，算的时候是10－1＋1＝10项
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