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流星	2008-6-26 07:34 AM

有關MATHS(F.2)

唔知呢度有冇人係讀KLC...
今年考試F.2既數好難
想問大家條數...

美芬有$(1-x+x²)和麗儀有$(1+x-x²)。問美芬比麗儀多多少元?
點解答案係$(2x²-2x)??

my_1000hk

2008-6-26 09:04 AM

將美芬有$(1-x+x²)減麗儀有$(1+x-x²)
(1-x+x²)-(1+x-x²)
拆括號
1-x+x²-1-x+x²
=2x²-2x

牙FA	2008-6-26 09:06 AM

(1-x+x²)-(1+x-x²)
=1-x+x²-1-x+x² ← - -得+
=1-1-x-x+x²+x²
=2x²-2x

yghnb123

2008-6-26 10:02 AM

好勁呀= =
其實都唔係好難姐

流星	2008-6-28 02:43 PM

[quote]原帖由 [i]my_1000hk[/i] 於 2008-6-26 05:04 PM 發表
將美芬有$(1-x+x²)減麗儀有$(1+x-x²)
(1-x+x²)-(1+x-x²)
拆括號
1-x+x²-1-x+x²
=2x²-2x [/quote]

唔該哂你呀...!!

流星	2008-6-28 02:44 PM

[quote]原帖由 [i]牙FA[/i] 於 2008-6-26 05:06 PM 發表
(1-x+x²)-(1+x-x²)
=1-x+x²-1-x+x² ← - -得+
=1-1-x-x+x²+x²
=2x²-2x [/quote]

THANKS!!

流星	2008-6-28 02:45 PM

[quote]原帖由 [i]yghnb123[/i] 於 2008-6-26 06:02 PM 發表
好勁呀= =
其實都唔係好難姐 [/quote]

你串我呀...!!
不過依家睇番都真係幾易...

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