回複:simplify an expression = 1

Note: [sqrt(3)+sqrt(2)]^2 = 2sqrt(6)+5

Therefore,
expression=10[[sqrt(3)+sqrt(2)]^2-[sqrt(3)+sqrt(2)][9sqrt(3)+11sqrt(2)]
=[sqrt(3)+sqrt(2)][sqrt(3)-sqrt(2)]
=1

所有跟帖: 

Ding! -yma16- 給 yma16 發送悄悄話 yma16 的博客首頁 (0 bytes) () 02/24/2009 postreply 11:04:42

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