(X+Y)^4-X^4-Y^4
的因式分解
算式麻煩列出
謝謝
2005-08-26 20:38:03 · 3 個解答 · 發問者 Anonymous in 科學 ➔ 數學
什麼是巴斯卡三角形???
2005-08-27 09:15:57 · update #1
什麼是巴斯卡三角形???
2005-08-27 09:16:35 · update #2
=(X+Y)4-X4-Y4 =(X+Y)4-X4-Y4 -2X2Y2+2X2Y2=(X+Y)4-(X2+Y2)2+2X2Y2=(X2+Y2+2XY)2-(X2+Y2)2+2X2Y2=(X2+Y2)2+2XY(X2+Y2)+4X2Y2-(X2+Y2)2+2X2Y2=2XY(X2+Y2)+6X2Y2=2XY[(X2+Y2)+3XY]
2005-08-26 20:50:42 · answer #1 · answered by Anonymous · 0⤊ 0⤋
(X+Y)^4-X^4-Y^4 =4X3Y+6X2Y2+4XY3(巴斯卡三角形展開)=2XY(2X2+3XY+2Y2)
2005-08-27 03:55:35 補充:
江仔:
第三行錯了,(X^2+Y^2+2XY)^2的展開式,中間應是4XY(X^2+Y^2)
2005-08-26 23:45:09 · answer #2 · answered by ? 7 · 0⤊ 0⤋
有學過二項是定理嗎 組合概念那個...
將(x+y)^4拆成 X^4+4X^3Y+6X^2Y^2+4XY^3+Y^4
加完在提公因式就可以啦...
2005-08-26 20:52:05 · answer #3 · answered by no nickname 3 · 0⤊ 0⤋