来自冯海林的问题
怎样计算:(x+y+z)*(-x+y+z)*(x-y+z)*(x+y-z)怎样把括号去掉?
怎样计算:(x+y+z)*(-x+y+z)*(x-y+z)*(x+y-z)怎样把括号去掉?
1回答
2020-07-15 17:39
怎样计算:(x+y+z)*(-x+y+z)*(x-y+z)*(x+y-z)怎样把括号去掉?
怎样计算:(x+y+z)*(-x+y+z)*(x-y+z)*(x+y-z)怎样把括号去掉?
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