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Yahoo!奇摩知識+ - 分類問答 - 科學常識 - 已解決
Yahoo!奇摩知識+ - 分類問答 - 科學常識 - 已解決 
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國中數學 請附計算過程
Dec 24th 2013, 03:29

1.a^2(－b^2＋2bc－c^2)=a^2－(b-c)^2=(a-b+c)(a+b-c)
乙丙 C
2.x代0,y代0 (A)(0,2)(-1,0)通過一二三
3.(x＋1)(2x＋3)－10＝2(x－a)(x－b),x代-1
(1＋1)(2＋3)－10＝2(1+a)(1+b),(1+a)(1+b)=0
4.(1)90x=y (2)180 (3)13/4*90=292.5
5.1/x小於-1 +,- D

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