maths.....

截拳道小子

[QUOTE=忍者小靈叮]係喎...

愈黎愈亂添 [/QUOTE]


27-->(-1)(-3)^3
but 多左個 -1  

忍者小靈叮

[QUOTE=截拳道小子]

27-->(-1)(-3)^3
but 多左個 -1  [/QUOTE]
即係點...

kalok914

27 * (-1/3)^(2n-1)
=3^3 * (-3)^(1-2n)
=-(-3)^3 * (-3)^(1-2n)
=-(-3)^(4-2n)
=-(3)^(4-2n) (because 4-2n is a even number)
唔知有冇計錯

截拳道小子

[QUOTE=kalok914]27 * (-1/3)^(2n-1)
=3^3 * (-3)^(1-2n)
=-(-3)^3 * (-3)^(1-2n)
=-(-3)^(4-2n)
=-(3)^(4-2n) (because 4-2n is a even number)
唔知有冇計錯[/QUOTE]

Raul

[QUOTE=截拳道小子][/QUOTE]
即係點

截拳道小子

[QUOTE=Raul]即係點 [/QUOTE]
好勁
我唔記得左可以變番正