中三數學題

2007-10-02 1:39 am
3x^2 + xy - 2y^2

因式係咩

回答 (2)

2007-10-02 1:42 am
✔ 最佳答案
3x^2 + xy - 2y^2
=(3x-2y)(x+y)

2007-10-06 14:15:50 補充:
其實用Cross Method就得3x -2y × x +y---------------3xy - 2xy = xy所以便是(3x - 2y)(x+y)
2007-10-03 3:07 am
3x^2 + xy - 2y^2
=x(3x)+xy-y(2y)
=(3x+2y)(x-y)
參考: me


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