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ch1997jimmy (É@·Ç±¡¤HÉ@)
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µoªí©ó 2013-2-24 12:51 PM  ¸ê®Æ ¤å¶° µu®ø®§ 
¤¤¥|¼Æ¾Ç¥\½Ò ¨D¸Ñ!!!~

§Úª¾«Y¦n®e©ö,¦ý«Y¤W°óÉNÅ¥®Ñµ²ªG­øÃÑÅo.

1.¤Æ²(x^3+2x+5)+(2x^2+3x+4).

2.®i¶}(2x+5)(x^2+6x+3).

3.­YAx+B=-5x-8,¨DA©MBªº­È.

4.­YA(x+1)2+B(x+1)+C=2x^2+3x+2,¨DA,B,Cªº­È.

5.­Y(x-2)(x+3)=Ax^2+Bx+C,¨DA,B,Cªº­È.

ªø°£ªk
6.(3x^2+2x+7)°£(x-1)

7.(x^2-8x+5)°£(x+3)

­øª¾¦³ÉNÃä­Ó¦n¤ß¤HÀ°¤U¤â,¦³ÉN¤ÙªùÃÓ°O¦P¾Ç

¥t¥~­øª¾¦³ÉNµo¿ù°Ï.­ø¸Ó¤j®a

¥ò¦³¦pªGx«á­±¦³¼Æ¦r§Y«Yx2¦¸¦n¦ü²Ä6±ø3x2.

[ ¥»©«³Ì«á¥Ñ ch1997jimmy ©ó 2013-2-24 09:57 PM ½s¿è ]



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µoªí©ó 2013-2-24 05:49 PM  ¸ê®Æ ¤å¶° µu®ø®§  pigpigpigpigq@yahoo.com.hk
¦³d­ø¨Ï聴³£ÃÑ°Õ~e.g. 1,2,3,6,7



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hh36471288hk (Samuel Ysc)
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µoªí©ó 2013-2-24 06:05 PM  ¸ê®Æ ¤å¶° µu®ø®§ 
1.¤Æ²(x^(3)+2x+5)+(2x^(2)+3x+4).

(x^(3)+2x+5)+(2x^(2)+3x+4)
= x^(3)+2x^(2)+2x+3x+5+4
= x^(3)+2x^(2)+5x+9 //



2.®i¶}(2x+5)(x2+6x+3).

x2 «Y«} = x^2
§Ú·í x2 «Y x­¼¥H2 ¦í ¿ùµ¥°}¦A§ï

x2 = x2 ª©¥» :
(2x+5)(x2+6x+3)
= [(2x)(x2+6x+3)+(5)(x2+6x+3)]
= [(2x)(2x+6x+3)+(5)(2x+6x+3)]
= [(2x)(8x+3)]+[(5)(8x+3)]
= [16x^(2)+6x]+(40x+15)
= 16x^(2)+6x+40x+15
= 16x^(2)+46x+15 //

x2 = x^(2) ª©¥» :
(2x+5)(x2+6x+3)
= (2x+5)[x^(2)+6x+3]
= {(2x)[x^(2)+6x+3]} + {5[x^(2)+6x+3]}
= [2x^(3)+12x^(2)+6x] + [5x^(2)+30x+3]
= 2x^(3)+17x^(2)+36x+3 //

3.­YAx+B=-5x-8,¨DA©MBªº­È.
A = -5
B = -8 //

4.­YA(x+1)2+B(x+1)+C= 2x2+3x+2 ,¨DA,B,Cªº­È.
A = A(x+1)2 = 2x2
B = B(x+1) = 3x
C = 2 //

¤²_ §^°O±oÂI­p

5.­Y(x-2)(x+3)=Ax2+Bx+C,¨DA,B,Cªº­È.
(x-2)(x+3)=Ax2+Bx+C
x^(2)+3x-2x-6=Ax2+Bx+C
x^(2)+x-6=Ax2+Bx+C
.
.
.

Ax2 ©j«Y«§®Æ?
(2)(A)(X) ¡H
ax^(2)¡H


§Ú·í Ax2 «Y Ax^(2) ¦í µ¥°}¦A§ï
(x-2)(x+3)=Ax2+Bx+C
x^(2)+3x-2x-6=Ax2+Bx+C
x^(2)+x-6=Ax2+Bx+C

¥N¤JA,B,C
A = 1
B = 1
C = -6 //


6.§Q¥Îªø°£ªk±o¥X (3x2+2x+7)°£(x-1)

§Ú·í 3x2 «Y 3x^(2) ¦í ¿ùµ¥°}¦A§ï
(3x2+2x+7) / (x-1)
=[3x^(2)+2x+7] / (x-1)

.........3x+5
(x-1) / 3x^(2)+2x+7
......-(3x^(2)-3x      
......................5x+7
....................-(5x-5
.........................12

°Ó¦¡ = 3x+5
¾l¦¡ = 12

(3x+5)(x-1)+12
= 3x^(2)-3x-5+5x+12
= 3x^(2)+2x+7



7.§Q¥Îªø°£ªk±o¥X (x2-8x+5)°£(x+3)

§Ú·í x2 «Y x^(2) ¦í ¿ùµ¥°}¦A§ï
(x2-8x+5) / (x+3)
= [x^(2)-8x+5] / (x+3)

...........x      -11
(x+3) / x^(2)-8x+5
........-(x^(2)+3x   
..................-11x+5
...............-(-11x-33
........................38 //

°Ó¦¡ = x-11
¾l¦¡ = 38

(x-11)(x+3)+38
= 2x^(2)+3x-11x-33+38
= 2x^(2)-8x+5 //


­p¿ù§^Ãö§Ú¨Æ

¨D100 YK

[ ¥»©«³Ì«á¥Ñ hh36471288hk ©ó 2013-2-24 09:37 PM ½s¿è ]



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ch1997jimmy (É@·Ç±¡¤HÉ@)
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µoªí©ó 2013-2-24 07:48 PM  ¸ê®Æ ¤å¶° µu®ø®§ 
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§Ú«Yªì¤¤ªG®É³£ÉNÅ¥®Ñ,©Ò¥HE®a³£­øÃÑ.

¦^ÂÐ #3 hh36471288hk
­ø¸Ó§r  x3§Y«Yx^(3)§Ú­øª¾À³¸ÓÂI¥´.
¥ò¦³Ax2=Ax^(2) ²Ä¤@±ø¥´¿ù¥ª«Y(X^3+2x+5)+(2x^2+3x+4)
²Ä¤­±øµª®×À³¸Ó«Yc=-6­ø«Yx=-6.  
100YK´NÉN°Õ. °eªð x100¤ñ§A¥ý

[ ¥»©«³Ì«á¥Ñ ch1997jimmy ©ó 2013-2-24 08:11 PM ½s¿è ]



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hh36471288hk (Samuel Ysc)
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µoªí©ó 2013-2-24 08:44 PM  ¸ê®Æ ¤å¶° µu®ø®§ 
¦^ÂÐ #4 ch1997jimmy ªº©«¤l

²Ä¤@±ø¥´¿ù¥ª¡H¡I
Fack



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µoªí©ó 2013-2-24 08:46 PM  ¸ê®Æ ¤å¶° µu®ø®§  --hidden--
1. (X^3+2x+5)+(2x^2+3x+4)
    =X^3 + 2X + 5 + 2X^2 + 3X + 4
    = 3X^3 + 5X + 9

2. (2X+5)(X^2+6X+3)
    = 2X^3 + 17X^2 + 36X + 15

3. ­YAx+B=-5x-8,¨DA©MBªº­È
    A = -5
    B = -8

4. ­YA(X+1)2+B(x+1)+C=2x2+3x+2,¨DA,B,Cªº­È.  <- 2x2 = 2X^2 ?  , A(x+1)2 = A(x+1)^2 ?



5. (X-2)(X+3)=AX^2+BX+C
    X^2 + X - 6 = AX^2 + BX + C
    A = 1
    B = 1
    C = -6

6. (3x^2+2x+7)°£(x-1)  <- ¦Û¤v­p¡A§Ú²bª±µu°£
    |3   2   7
  1|     3   5
    |3   5   7

Quotient = 3X + 5
Reminder = 12

7. (X^2-8X+5)°£(X+3)  <- ¦Û¤v­p¡A§Ú²bª±µu°£
    |1   -8   5
  -3|     -3   33
    |1   -11   38

Quotient = X - 11
Reminder = 38



³Ìªñ¢´¦¸µû¤À°O¿ý
hh36471288hk   2013-2-24 09:38 PM   YK¹ô  +1   ²Ä¤@ÃD¤Ö­p¥ª 2x^2



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¦^ÂÐ #7 ch1997jimmy ªº©«¤l

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­Ó§rsir±Ð±oºC,À³¸Ó¸ÜÊ\±Ð±o¸Ô²Ó¬J.
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