(100²-99²)+﹙98²-97²﹚+...(2-1)²=
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(100²-99²)+﹙98²-97²﹚+...(2-1)²=
(100²-99²)+﹙98²-97²﹚+...(2-1)²=
(100²-99²)+﹙98²-97²﹚+...(2-1)²=
平方差公式.100²-99²=(100-99)*(100+99)=199.类推
百科 平方差 即可,清楚明了些.