原式=[x^2-(y-z)^2]*[(y-z)^2-x^2]
=-[x^2-(y-z)^2]^2
=-x^4+2x^2(y-z)^2-(y-z)^4
怎样计算：（x+y+z）*（－x+y+z）*（x－y+z）*（x+y－z） 怎样把括号去掉?
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