x(x+y)(x-y)-x(x+y)^2
回答 (3)
2010-09-04 6:14 am
唔sure -2(x^2)y-2x(y^2)
2010-09-03 22:18:00 補充：
係 負2(x^2)y, 再減2x(y^2)
hope it can be clear
2010-09-03 22:18:00 補充：
係 負2(x^2)y, 再減2x(y^2)
hope it can be clear
2010-09-04 6:11 am
=(x^2+yx)(x-y)-x^4-xy^2
=x^3-x^2y+x^2y-xy^2-xy^2-x^4
=x^3-x^4-2xy^2
=-x-2xy^2
=x^3-x^2y+x^2y-xy^2-xy^2-x^4
=x^3-x^4-2xy^2
=-x-2xy^2
參考: me
2010-09-04 6:08 am
x(x+y)(x-y)-x(x+y)^2
=x[(x^2-y^2)-(x^2+2xy+y^2)]
=x(x^2 -y^2 -x^2 -2xy -y^2 )
=x(2xy-2y^2)
=2xy(x-y)
=x[(x^2-y^2)-(x^2+2xy+y^2)]
=x(x^2 -y^2 -x^2 -2xy -y^2 )
=x(2xy-2y^2)
=2xy(x-y)
參考: me=]
收錄日期: 2021-04-13 17:29:44
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20100903000051KK01474