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数学乐园据报道,有人发现埃塞俄比亚的一些部落的居民,至今只会作数字的加倍和减半运算,他们唯一的运算工具是小石块。可是用这最原始的工具和简单方法,他们能求得任何两数的积。例如他们要计算!“#
It has been reported that some people in Ethiopia have found that residents of some Ethiopian tribes have so far only doubled and halved the figures. Their only operating tool is the small stones. But with this primitive tool and the easy way, they can find any two numbers of products. For example they want to calculate! ”#