在4,9,14,19,24,29......数列中，第n个数是多少？ 1,-4,-9,-14,-19该数列的第n个数是多少？
\u89c2\u5bdf\u4e00\u5217\u6570\uff1a4\uff0c9\uff0c14\uff0c19\uff0c24\uff0c29...\uff0c\u4f9d\u6b64\u89c4\u5f8b\uff0c\u5728\u6b64\u6570\u5217\u4e2d\u7b2c20\u4e2a\u6570\u662f____\uff0c2004\u662f\u7b2c_____\u4e2a\u6570\uff1f\u7b2c20\u4e2a\u662f99,2004\u662f10019
1\u3001-4\u3001-9\u3001-14\u3001-19\u8fd9\u662f\u4e00\u4e2a\u7b49\u5dee\u6570\u5217\uff0c\u5373\u9996\u9879\u4e3a1\u7684\u7b49\u5dee\u6570\u5217\u3002\u6240\u4ee5\u7b2cn\u4e2a\u6570\u4e3a:1-5\uff08n-1\uff09\u3002
解答：4=1*4+0，9=2*4+1，14=3*4+2，19=4*4+3，24=5*4+4,29=6*4+5，……
规律为：4*n+(n-1)=5n-1
同学你好，如果问题已解决，记得右上角采纳哦~~~您的采纳是对我的肯定~谢谢哦
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