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Old 04-07-2011, 05:21 PM   #1
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1.十几乘十几:
口诀:头乘头,asics ultimate 81,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,不够两位数要用0占位。
  2.头相同,脑筋急转弯,若干,尾互补(尾相加等于10):
口诀:一个头加1后,头乘头,timberland 6 inch boots,尾乘尾,nike dunk sb low for
例:23×27=?
解:2+1=3
  2×3=6
  3×7=21
23×27=621
注:个位相乘,onitsuka rotation 77,不够两位数要用0占位。
  3.第一个乘数互补,另一个乘数数字相同:
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,不够两位数要用0占位,asics gel stratus 2.1
  4.几十一乘几十一:
口诀:头乘头,mens birkenstock sandals,头加头,尾乘尾,没花钱的不是
例:21×41=?
解:2×4=8
2+4=6
1×1=1
21×41=861
  5.11乘任意数:
口诀:首尾不动下落,中间之和下拉。
例:11×23125=?
解:2+3=5
3+1=4
1+2=3
2+5=7
2和5分别在首尾
11×23125=254375
注:和满十要进一,moncler boots
  6.十几乘任意数:
口诀:第二乘数首位不动向下落,第一因数的个位乘以第二因数后面每一个数字,加下一位数,Coach Handbags,再向下落,国行联通版iPhone4永久恢复YouTube程序图标(小电视,非Safari标签)方法
例:13×326=?
解:13个位是3
3×3+2=11
3×2+6=12
3×6=18
13×326=4238
注:和满十要进一,supra skytop red
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