✔ 最佳答案
1. 把 x4 + x2y2 + y4 分解為因式
Sol:
x4 + x2y2 + y4
= x4 + 2x2y2 + y4 - x2y2
= ( x2 + y2 ) - (xy)2
= ( x2 - xy + y2 ) ( x2 + xy + y2 )
Ans: ( x2 - xy + y2 ) ( x2 + xy + y2 )
2. 把 x6 - y6 寫成兩個立方的差, 由此分解 x6 - y6 為因式
x6 - y6
= (x3)2 - (y3)2
= ( x3 - y3 ) ( x3 + y3 )
= ( x - y ) ( x2 + xy + y2 ) ( x + y ) ( x2 - xy + y2 )
= ( x - y ) ( x + y ) ( x2 - xy + y2 ) ( x2 + xy + y2 )
Ans: ( x - y ) ( x + y ) ( x2 - xy + y2 ) ( x2 + xy + y2 )
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