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1化簡(√7-√5)2(√5+√7)2?
請各位幫幫忙了!!加過程喔!!

2006-10-12 13:41:51 · 3 個解答 · 發問者 Anonymous in 教育與參考 考試

3 個解答

(√7-√5)2(√5+√7)2
=((√7-√5)(√5+√7))2
=(7-5)2
=(2)2
=4

2006-10-12 17:47:54 補充:
(a+b)(a-b)=a^2-ab+ab-b^2=a^2-b^2

2006-10-12 13:46:58 · answer #1 · answered by no nickname 2 · 0 0

(√7-√5)^2 *(√5+√7)^2
=(√7-√5)*(√7+√5)*(√7-√5)*(√7+√5)
=(7-5)*(7-5)
= 4

( a - b )*( a + b )= a^2 - b^2

2006-10-12 13:48:58 · answer #2 · answered by ? 3 · 0 0

(√7-√5)2(√5+√7)2中間是乘號還是除號

2006-10-12 13:44:14 · answer #3 · answered by ~~初學者六級~~ 7 · 0 0

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