我唔識得做啊教下我啊 ! ! 急!!!

2007-11-26 1:11 am
1 . ( 2b 2 - bc ) - (b 2 a - 2cb + 5a 2 b )

2 . ( 2a - b +c ) + ( 3a-b+c )-( a - 2b - 3c )

3 . ( 5y 2 + x - 3z ) + ( 2z - 5x ) - ( 4z - 6y 2 )
更新1:

我要有式唔係齋要答案啊 ! ! THZ

更新2:

1 . b後面係次方 , a後面係次方 3 . y後面係次方

回答 (3)

2007-11-26 1:40 am
✔ 最佳答案
閣下如此表達次數十分使人混淆,如果你要表達次數有兩種方法:
(一)以^來表示,如x的2次方可以x^2來表達;
(二)按著鍵盤上的Alt,打178,便可打出「²」,如此類推:
Alt+170=ª;Alt+179=³;Alt+185=¹;Alt+186=º;Alt+188=¼;Alt+189=½;Alt+190=¾
(1) (2b²-bc)-(b²a-2cb+5a²b)
=2b²-bc-ab²+2bc-5a²b
=2b²-ab²-5a²b+bc
(2) (2a-b+c)+(3a-b+c)-(a-2b-3c)
=2a-b+c+3a-b+c-2a+2b+3c
=2a+3a-2a-b-b+2b+c+c+3c
=3a+5c
(3) (5y²+x-3z)+(2z-5x)-(4z-6y²)
=5y²+x-3z+2x-5x-4z+6y²
=11y²-4x-7z
2007-11-27 2:04 am
ª½¾²³
2007-11-26 1:17 am
1. 2b 2 ?...b2a? or 2ab?


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