3,6,10,15,21,28,36,45,55,66找规律通项公式。
3\uff0c6\uff0c10\uff0c15\uff0c21\uff0c28\uff0c36\uff0c45\uff0c55\uff0c66\u627e\u89c4\u5f8b\u901a\u9879\u516c\u5f0f\u3002\u8fd9\u662f\u4e2a\u601d\u8def\uff0c\u53c2\u8003\u4e00\u4e0b\u5427
3=1+2\uff0c6=1+2+3\uff0c10=1+2+3+4\uff0c15\u3002\u3002\u3002\u4ee5\u6b64\u7c7b\u63a8\uff0c\u53ef\u5f97\u8fd9\u4e2a\u6570\u5217\u662f\u4e00\u4e2a\u7b49\u5dee\u6570\u5217\u7684\u524dn\u9879\u548c\uff0c\u5957\u7b49\u5dee\u6570\u5217\u524dn\u9879\u548c\u7684\u516c\u5f0f\uff0c\u5c31\u80fd\u5f97\u51fa\u8fd9\u4e2a\u6570\u5217\u7684\u901a\u9879\u516c\u5f0f
规律:3=1+2
6=1+2+3
10=1+2+3+4
15=1+2+3+4+5
通项公式:n(n+1)/2(n为正整数)
相邻两个数字之间相差的数是等差数列,公式就是(n+1)(n+2)/2
差为等差数列
规律:3=1+2
6=1+2+3
10=1+2+3+4
15=1+2+3+4+5通项公式:n(n+1)/2(n为正整数)
An=(n²+3n+2)/2
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