因式分解x4+3x2y2-28y4

4 2 2 4都代表次幂
2025-05-23 03:38:09
推荐回答(2个)
回答1:

=(X2+7y2)(X2-4y2)
=(X2+7y2)(X+2y)(X-2y)

回答2:

=(X2+7y2)(X+2y)(X-2y)