汕头做岗亭厂家:因式分解:(x+y+z)^5-x^5-y^5-z^5.
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因式分解=[(x+y+z)^5-x^5]-(y^5+z^5)
=(x+y+z-x)[(x+y+z)^4+x(x+y+z)^3+
x^2(x+y+z)^2+x^3(x+y+z)+x^4]-
(y+z)(y^4-y^3z+y^2z^2-yz^3+z^4)
=(y+z)[(x+y+z)^4+x(x+y+z)^3+x^2(x+y+z)^2+
x^3(x+y+z)+x^4-y^4+y^3z-y^2z^2+yz^3-z^4]
因式分解:(x+y+z)^5-x^5-y^5-z^5
因式分解:(x+y+z)^5-x^5-y^5-z^5.
因式分解(x+y+z)^3-(y+z-x)^3-(z+x-y)^3-(x+y-z)^3
x+y+z=15 x+5y+10z=70 x,y,z,各是几?
x+y+z=15 x+5y+10z=70 x,y,z,各是几?
因式分解x^3(y^2-z^2)+y^3(z^2-x^2)+z^3(x^2-y^2)
下列式子不能用平方差计算公式算的是A(x-y-z)(-x+y+z) B(-2x+3y)(3y+2x) C(x+y+z)(x-y+z) D(-5-X)(X-5
若x : y : z =1 :3 :5 则x+3y-z /x-3y+z=? 若x /y+z=y /x+z=z /x+y=k 则k=?
求(2x-3y+z)-3{x-2[-z+(x-y)]-(3y-5x)}+1的结果是多少?
2x+5y+4z=0,3x+y-7z=0,则x+y-z=?