標題:
MATHS LONG Q
發問:
此文章來自奇摩知識+如有不便請留言告知
X2 - (Y-Z)2 X2 = (Y-Z)2 X = Y-Z X - Y + Z =0 (我可吾可以咁做?) 2X (N+1) - 7X (N) - 15X (N-1) (括號是次方)
最佳解答:
X2 - (Y-Z)2=0 X2 = (Y-Z)2
其他解答:
I think the correct answers are: X^2 - (Y-Z)^2 [Applying a^2-b^2 = (a+b)(a-b)] =[X+(Y-Z)][X-(Y-Z)] =(X+Y-Z)(X-Y+Z) 2X^(N+1) - 7X^N - 15X^(N-1) =X^(N-1) (2X^2 - 7X - 15) =X^(N-1) (2X+3)(X-5)
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