x3y3z33xyz用因式定理的思路因式分解

2021-03-03 21:39:54 字數 1796 閱讀 2336

1樓:g弦上的華彩

設f(x)=x^3-(3yz)x+y^3+z^3其中y^3+z^3=(y+z)(y^2-yz+z^2),即f(x)=x^3-(3yz)x+(y+z)(y^2-yz+z^2)

嘗試得(x+(y+z))為原式的因式,因為f(-(y+z))=-(y+z)^3+(3yz)(y+z)+y^3+z^3=0

於是用大除法計算(x^3-(3yz)x+y^3+z^3)/(x+(y+z)),得到另一因式為x^2-(y+z)x+y^2+z^2-yz

最後整理得到(x+y+z)(x²+y²+z²-xy-xz-yz)

2樓:匿名使用者

x^3+y^3+z^3-3xyz

=x³+3x²y+3xy²+y³ +z³ -3xyz-3xy²-3x²y

=(x+y)³+z³ -3xy(x+y+z)=(x+y+z)[(x+y)²-(x+y)z+z²]-3xy(x+y+z)

=(x+y+z)(x²+y²+z²-xy-xz-yz)

x^3+y^3+z^3-3xyz因式分解

3樓:網際超人

= (x^3+3yx^2+3xy^2+y^3)+z^3-3xyz-3yx^2-3xy^2

= (x+y)^3+z^3-3xy(x+y+z)= (x+y+z)[(x+y)^2-(x+y)z+z^2]-3xy(x+y+z)

= (x+y+z)[(x^2+2xy+y^2-xz-yz+z^2)-2xy]

= (x+y+z)(x^2+y^2+z^2-xy-yz-zx)不懂還可問,滿意請及時採納!o(∩_∩)o

x^3+y^3+z^3-3xyz因式分解

4樓:匿名使用者

x³+y³+z³-3xyz

=(x+y+z)(x²+y²+z²-xy-xz-yz)

(這用到的是公式a³+b³+c³-3abc=(a²+b²+c²-ab-ac-bc))

5樓:虎慈建萍韻

^^^x^3+y^3+z^3-3xyz

=(x^3+3yx^2+3xy^2+y^3)+z^3-3xyz-3yx^2-3xy^2

=(x+y)^3+z^3-3xy(x+y+z)=(x+y+z)[(x+y)^2-(x+y)z+z^2]-3xy(x+y+z)

=(x+y+z)[(x^2+2xy+y^2-xz-yz+z^2)-2xy]

=(x+y+z)(x^2+y^2+z^2-xy-yz-zx)

(x^3+y^3+z^3-3xyz)怎麼因式分解?

6樓:匿名使用者

x³+y³+z³-3xyz

=x³+3x²y+3xy²+y³+z³-3x²y-3xy²-3xyz=(x+y)³+z³-3xy(x+y+z)=(x+y+z)(x²+2xy+y²-xz-yz-3xy)=(x+y+z)(x²+y²+z²-xy-yz-xz)

因式分解(x+y+z)^3-x^3-y^3-z^3

7樓:小賤

^參考下面

(x+y+z)^3-x^3-y^3-z^3=3yx^2+3xy^2+3xz^2+3yz^2+3zx^2+3zy^2+6xyz

=3xy(x+y)+3z^2(x+y)+3z(x^2+y^2+2xy)

=3xy(x+y)+3z^2(x+y)+3z(x+y)^2=3(x+y)[xy+z^2+z(x+y)]=3(x+y)[x(y+z)+z(y+z)]=3(x+y)(x+z)(y+z)、

、好評,,o(∩_∩)o謝謝

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