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一、分解因式 :x3+x2 y -xy2 -xz2 +yz2 -y3.解 :原式 =(x3+x2 y) -(xy2 +y3) +(z2 y-xz2 )=(x +y)x2 -y2 (x +y) -z2 (x -y)=(x +y) (x2 -y2 ) -z2 (x -y)=(x +y) 2 (x -y) -z2 (x -y)=(x -y) (x +y +z) (x +y -z) .二、
First, the decomposition factor: x3 + x2 y - xy2 - xz2 + yz2 - y3. Solution: the original = (x3 + x2 y) - (xy2 + y3) + (z2 y-xz2) = (x + y) x2 -y2 (x +y) -z2 (x -y)=(x +y) (x2 -y2) -z2 (x -y)=(x +y) 2 (x -y) -z2 (x -y )=(x -y) (x +y +z) (x +y -z) . II.