數學．．．不明白
x(x+C)=(x+1)^2+D
可以點樣計...詳細列色
同埋..我好多F.2的數刀唔明
可唔可以教埋我
>.
F.2的數
2006-11-10 5:46 am
回答 (4)
2006-11-10 5:52 am
✔ 最佳答案
x(x+C)=(x+1)^2+Dx ^ 2 + xC = x ^ 2 + 2x + 1 + D
比較左面和右面可知
D = -1 因為左面不含常數項，即常數項 = 0 ，所以 D + 1 = 0
C = 2 原因和上面相似
2006-11-10 6:10 am
x(x+c) = (x+1)^2+d
x^2+xc = (x+1) (x+1)+d
x^2+xc = x^2+x+x+1+d
x^2+xc = x^2+2x+1+d
x^2-x^2+xc = 2x+1+d
xc = 2x+1+d
xc-2x = 1+d
xc-2(x) = 1+d
x(c-2) = 1+d
x = c-2/1+d
x^2+xc = (x+1) (x+1)+d
x^2+xc = x^2+x+x+1+d
x^2+xc = x^2+2x+1+d
x^2-x^2+xc = 2x+1+d
xc = 2x+1+d
xc-2x = 1+d
xc-2(x) = 1+d
x(c-2) = 1+d
x = c-2/1+d
參考: ME
2006-11-10 6:00 am
L.H.S.=x^2+cx
R.H.S.=(x+1)^2+D
=x^2+2x+1+D
by doing comparison,
C=2,D= -1
2006-11-09 22:04:32 補充：
8over12a=2over3a3over xxy over 6=1over2xxy
R.H.S.=(x+1)^2+D
=x^2+2x+1+D
by doing comparison,
C=2,D= -1
2006-11-09 22:04:32 補充：
8over12a=2over3a3over xxy over 6=1over2xxy
2006-11-10 5:51 am
呀..你e個係咪展開咋?
^點解?
^點解?
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