2x3x4x5x6x7x8x9÷2=181440,有咩方法是又快又簡單來計(10點)
回答 (3)
2007-04-03 4:23 pm
✔ 最佳答案
2x3x4x5x6x7x8x9÷2=1814403x4x5x6x7x8x9=181440
27(3x9)x32(4x8)x30(5x6)x7x2÷2=181440
27(3x9)x32(4x8)x30(5x6)x7=181440
27x32x30x7=181440
864x210=181440
參考: me
2007-04-03 5:42 am
用計算機 (fx-3650)
按 (9!=1*2*3*4*5*6*7*8*9)
9! /2
=181440
or
2x3x4x5x6x7x8x9÷2
=3x4x5x6x7x8x9
=12x5x6x7x8x9
=12x30x7x8x9
=360x7x8x9
=360x56x9
=3240x56
=181440
按 (9!=1*2*3*4*5*6*7*8*9)
9! /2
=181440
or
2x3x4x5x6x7x8x9÷2
=3x4x5x6x7x8x9
=12x5x6x7x8x9
=12x30x7x8x9
=360x7x8x9
=360x56x9
=3240x56
=181440
參考: me
2007-04-03 5:25 am
`用計算機
收錄日期: 2021-04-12 17:41:58
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20070402000051KK04386