呢條題錯左D咩?

(2x3)(2x3)
= (2x3)(2)+(2x3)(3)
錯係呢步,
乘乘下點解走個加出黎
唔係以下情況喎
(2x3)(2+3)
= (2x3)(2)+(2x3)(3)
睇清楚..

首先就後(2x3)既2次方
之後就係(2x3)(2x3)
=(6)(6)拆( )號
=6x6
=36
--------------------------------------------------------------------------------------------------------------------
2x3)^2
=(2x3)(2x3)
=(2x3)(2)+(2x3)(3)<-----你上面都繼好左(2x3)(2x3)但點解會有個3呢？在那裡來的
=2x2+2x3+2x3+3x3
=4+6+6+9
=25

(2X3)^2
=6^2
=36


係唔係咁AR...
應用計()先...
唔好諗到咁複習... =]

(2x3)^2
=(2x3)(2x3) <--------唔可以噤拆 除非拒係 (2 x 3) x (2+ 3) 先可以拆到你下一個step
=(2x3)(2)+(2x3)(3)
=2x2+2x3+2x3+3x3
=4+6+6+9
=25

(2x3)^2------------------ok
=(2x3)(2x3)----------------ok...但你係應該張(2x3)變左做6...之後2次方即克搞掂...
=(2x3)(2)+(2x3)(3)
=2x2+2x3+2x3+3x3
=4+6+6+9
=25

so...it is:
(2x3)^2
=6^2
=36...that's it

(2x3)^2
=(2x3)(2x3)
=2x3x2x3
=6x6
=36

2007-10-07 21:47:24 補充：
第三個step出錯(2x3)(2x3)唔等於(2x3)(2) (2x3)(3)

2007-10-07 21:58:13 補充：
唔係, (2x3)(2x3)=(2x3)x(2x3)=2x3x2x3