(3x－4y)(-x－2y）
=?
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唔識計數.... 3
2006-11-23 2:03 am
回答 (6)
2006-11-23 2:06 am
✔ 最佳答案
-3x^2 - 2xy + 8y^22006-11-22 18:09:37 補充：
3x x -x = -3x^23x x -2y= -6xy-4y x -x= 4xy-4y x -2y= 8y^2-3x^2-6xy 4xy 8y^2=-3x^2-2xy 8y^2
2006-11-23 2:50 am
(3x－4y)(-x－2y）
=3x(-x-2y)-4y(-x-2y)
=3x^2-6xy+4xy+8y
=3x^2-2xy+8y
2006-11-22 18:51:22 補充：
(3x－4y)(-x－2y）=3x(-x-2y)-4y(-x-2y)=3x^2-6xy 4xy 8y^2=3x^2-2xy 8y^2
=3x(-x-2y)-4y(-x-2y)
=3x^2-6xy+4xy+8y
=3x^2-2xy+8y
2006-11-22 18:51:22 補充：
(3x－4y)(-x－2y）=3x(-x-2y)-4y(-x-2y)=3x^2-6xy 4xy 8y^2=3x^2-2xy 8y^2
2006-11-23 2:12 am
(3x－4y)(-x－2y）
= (3x)(-x)+(3x)(-2y)+(-4y)(-x)+(-4y)(-2y)
= - 3x^2 - 6xy + 8y^2 +4xy
= -3x^2 - 2xy + 8y^2 -------------
= (3x)(-x)+(3x)(-2y)+(-4y)(-x)+(-4y)(-2y)
= - 3x^2 - 6xy + 8y^2 +4xy
= -3x^2 - 2xy + 8y^2 -------------
2006-11-23 2:09 am
(3x－4y)(-x－2y)
=(3x)(-x－2y)－(4y)(-x－2y)
=-3x^2－6xy+4xy+8y^2
答案=8y^2－2xy－3x^2
=(3x)(-x－2y)－(4y)(-x－2y)
=-3x^2－6xy+4xy+8y^2
答案=8y^2－2xy－3x^2
2006-11-23 2:08 am
(3x－4y)(-x－2y)
= (3x)(-x) + (3x)(-2y) + (-4y)(-x) + (-4y)(-2y)
= -3x^2 - 6xy + 4xy + 8y^2
= -3x^2 - 2xy + 8y^2
= (3x)(-x) + (3x)(-2y) + (-4y)(-x) + (-4y)(-2y)
= -3x^2 - 6xy + 4xy + 8y^2
= -3x^2 - 2xy + 8y^2
收錄日期: 2021-04-13 00:26:31
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