which means: 62*65 can not use the same rule, and more...
所有跟帖:
• 多谢。不过对俺这种不是很数学脑子的人,还得讲的更浅。:) --梦蝶-- ♀ (0 bytes) () 01/22/2010 postreply 07:33:24
• the trick for his approach is: 62=60+2, and 68=70-2 -linda2- ♀ (0 bytes) () 01/22/2010 postreply 07:35:34
• 终于明白了。请问你测过IQ吗? :)) --梦蝶-- ♀ (10 bytes) () 01/22/2010 postreply 07:37:56