x^(1/3)+y^(1/3)+z^(1/3)=0
x^(1/3)+y^(1/3)=-z^(1/3)，兩邊立方
x+y+3x^(1/3)*y^(1/3)*[x^(1/3)+y^(1/3)]=-z
x+y+3x^(1/3)*y^(1/3)*[-z^(1/3)]=-z
x+y+z=3x^(1/3)*y^(1/3)*z^(1/3)
(x+y+z)^3=27xyz Q.E.D
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由 galaxylee 於 星期一 十月 31, 2005 10:44 pm
[數學]證明題
由 GFIF 於 星期一 十月 31, 2005 9:53 pm
設，求證: