2006-10-22 04:48 PM
EdWaRdLi
[quote]原帖由 [i]小蚊b[/i] 於 2006-10-22 16:39 發表
化簡
(2xy)^3 (x^2 y)^-2
-------------------------
xy
有冇人識計呀????
^ =指數
幫幫手...THZ [/quote]
(2xy)^3 (x^2 y)^-2
----------------------------
xy
8( x^3 )( y^3 )( x^-4 )( y^-2 )
= ---------------------------------------------
xy
= 8{ x^[ 3 + ( -4 ) - 1 ] }{ y^[ 3 + ( -2 ) - 1 ] }
= 8[ x^( 2 + ( -4 ) ][ y^( 2 - 2 ) ]
= 8( x^-2 )( y^0 )
8
= -------
x^2