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Old 03-19-2011, 06:07 AM   #1
juag7W4
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Join Date: Feb 2011
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1.十几乘十几:
心诀:头乘头,尾加尾,尾乘尾。
例:12×14=?
解: 1×1=1
  2+4=6
  2×4=8
12×14=168
注:个位相乘,没有够两位数要用0占位。
  2.头雷同,并不是没有能够的,尾互补(尾相加即是10):
口诀:一个头加1后,头乘头,尾乘尾。
例:23×27=?
解:2+1=3
  2×3=6
  3×7=21
23×27=621
注:个位相乘,不够两位数要用0占位。
  3.第一个乘数互补,玉灿、Jeny Plante,Women's MBT Chapa GTX shoes,另一个乘数数字雷同:
口诀:一个头加1后,头乘头,尾乘尾。
例:37×44=?
解:3+1=4
4×4=16
7×4=28
37×44=1628
注:个位相乘,没有够两位数要用0占位。
  4.几十一乘几十一:
心诀:头乘头,头加头,尾乘尾。
例:21×41=?
解:2×4=8
2+4=6
1×1=1
21×41=861
  5.11乘恣意数:
口诀:首尾不动着落,两头之和下推。
例:11×23125=?
解:2+3=5
3+1=4
1+2=3
2+5=7
2和5分离正在首尾
11×23125=254375
注:和谦十要入一。
  6.十几乘恣意数:
心诀:第两乘数首位没有意向下降,第一因数的个位乘以第两因数前面每一个数字,加下一位数,再 背着落。
例:13×326=?
解:13个位是3
3×3+2=11
3×2+6=12
3×6=18
13×326=4238
注:和谦十要入一。
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转载自 1234130 2010年01月29日 22:34 浏览(loading...) 评论(0) 分类:个己日忘


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