roger6515 wrote:98? Stallings wrote:不懂 原題目: 2 3 4 15 123 4 5 28 204 5 6 45 306 7 8 91 567 8 9 ?? 72 因為:4 5 6 45 30(4+5)*5+5*(6-5-1)=455 6 8 72 48(5+6)*6+6*(8-6-1)=72所以:6 7 9 ?? 63(6+7)*7+7*(9-7-1)=98
noelle wrote:一項數學挑戰!工程師...(恕刪) 我不知道我這樣拆題對不對單看?那一行就是15=5*328=7*445=9*566=11*6? =13*7=91大概30秒吧QQ~~~機械系畢業....