1*1+2*2+3*3+4*4+5*5+6*6+7*7+8*8+9*9=?
怎樣簡化????
Maths 叻 Plz ＣＯＭＥ ＩＮ
2006-12-05 7:06 pm
回答 (2)
2006-12-15 10:49 pm
1*1+2*2+3*3+4*4+5*5+6*6+7*7+8*8+9*9
=10+20+25+100+130
=30+25+230
=285
=10+20+25+100+130
=30+25+230
=285
2006-12-05 9:17 pm
1*1+2*2+3*3+4*4+5*5+6*6+7*7+8*8+9*9
=1+1+1+1+1+1+1+1+1
=1X9
=9
=1+1+1+1+1+1+1+1+1
=1X9
=9
收錄日期: 2021-04-29 18:53:45
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20061205000051KK00841