CE MATHS [復制鏈接]

let F( x ) be a polynomial. If F (x ) is disvisble by x-1 , WHich IS THE FACTOR OF F(2X+1)

A.X
B.X-3
C.2X-1
D.2X+1

引用第48樓rBB於2010-04-04 21:17發表的“”:
我真係覺得amaths都無一個topic難過maths d circle

same

引用第48樓rBB於2010-04-04 21:17發表的“”:
我真係覺得amaths都無一個topic難過maths d circle

d circle 好難睇
仲要加埋座標

引用第46樓丹尼屎於2010-04-04 20:47發表的“”:
can't agree anymore [表情]

我真係覺得amaths都無一個topic難過maths d circle

引用第46樓丹尼屎於2010-04-04 20:47發表的“”:
can't agree anymore [表情]

太多 property

引用第45樓rBB於2010-04-04 20:30發表的“”:
maths d circle仲難過amaths [表情]

can't agree anymore

引用第44樓丹尼屎於2010-04-04 17:48發表的“”:
頂唔順 d section B [表情] [表情] [表情] [表情]

maths d circle仲難過amaths

頂唔順 d section B

thanks 兩位

引用第38樓OldSosad於2010-04-04 16:36發表的“”:
我想問兩條 ..
6 men can finish a piece of work in 10days . If y more men are added, the work can be done in 4days. Find y.
A. 8　　B. 9　　C. 10　　D.11
.......

另外果條:

　2(a-b)^2 - a^2 + b^2
=2(a^2 - 2ab + b^2) - a^2 + b^2
=2a^2 - 4ab + 2b^2 - a^2 + b^2
=a^2 - 4ab + 3b^2
=(a-b)(a-3b)

Which of the following is a factor of 2(a-b)^2 - a^2 + b^2 ?

2(a-b)^2 - a^2 + b^2
=2 (a^2-2ab+b^2)-a^2+b^2
=a^2-4ab+3b^2
=(a-3b)(a-b)

6 men can finish a piece of work in 10days . If y more men are added, the work can be done in 4days. Find y.

6 men can finish a piece of work in 10days
1 men can finish 1/60 of work everyday

60/4 = 15

15-6=9

引用第38樓OldSosad於2010-04-04 16:36發表的“”:
我想問兩條 ..
6 men can finish a piece of work in 10days . If y more men are added, the work can be done in 4days. Find y.
A. 8　　B. 9　　C. 10　　D.11
.......

6 個人用左 10 日 : 6x10

(6+y) 個人用左 4 日 : (6+y)x4

.'. 60 = 24 + 4y
　　y = 9

我想問兩條 ..

6 men can finish a piece of work in 10days . If y more men are added, the work can be done in 4days. Find y.
A. 8　　B. 9　　C. 10　　D.11

答案 : B


Which of the following is a factor of 2(a-b)^2 - a^2 + b^2 ?
A. a-3b　　B. a-2b　　C. a+b　　D. a+3b

答案 : A



唔知點做呢?

引用第22樓朗仔於2010-04-01 17:51發表的“”:
ax^2+2bx+c=0 has two equal real roots, which of the following is/ara true?
I. both roots are -b/a
II. a,b,c form a geometric progression
III. a,b,c form an arithmetic progresion
.......

delta = 0
4b^2 - 4ac = 0
b^2 -ac = 0
b^2 = ac

by definition, II is correct

delta =0
roots = -2b\2a = -b/a