標題: 看看其他雙位數相乘work 唔work [打印本頁]

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作者: huichi0426    時間: 2013-1-12 07:33 PM     標題: 看看其他雙位數相乘work 唔work

97 = 100 - 3
96 = 100 - 4
97 x 96 = (100 - 3) (100 - 4)
= 100(100) - 4(100) - 3(100) + (-3)(-4)
= 100(100 - 4 - 3) + 12
= 100 (93) + 12
= 9312



[attach]1993036[/attach]

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作者: QstanleQz    時間: 2013-1-12 09:57 PM

這也可以哦。。不過有點兒複雜

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