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3.phân tích đa thức thành nhân tử a,(x+y+z) ³-x ³-y ³-z ³ b,$(x+y+z)^{2}$ - $x^{5}$ -$y^{5}$ -$z^{5}$ 4.Cho a+b+c=0 và $a^{2}$ +$b^{2}$+$c^{2}$=14 .Tính giá trị của biểu thức: A= $a^{4}$ +$b^{4}$+$c^{4}$
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