|
发表于 2-1-2008 02:56 PM
|
显示全部楼层
|
|
|
|
|
|
|
发表于 2-1-2008 03:16 PM
|
显示全部楼层
|
|
|
|
|
|
|

楼主 |
发表于 2-1-2008 03:17 PM
|
显示全部楼层
来做练习
大家来练习PMR form3的数学。
expand the following expression:
1. 4pq(3p + 13q)
2.-3m(6pn + 8n)
3.x^2(3xy + 2y)
4. -6pq(8pq^2 + 3p -3q)
5.-10xy(3xy -5y^2 +3x^2y)
factorize the following expression:
1. ax +4bx +2cx
2. 6a - 24c
3.10ab -30a
4. 4x +3xy
5.ab + bc - ad - cd
[ 本帖最后由 jernkhang 于 2-1-2008 03:37 PM 编辑 ] |
|
|
|
|
|
|
|
发表于 2-1-2008 03:18 PM
|
显示全部楼层
|
|
|
|
|
|
|

楼主 |
发表于 2-1-2008 03:22 PM
|
显示全部楼层
继续做练习
solve the following equation:
1. 1/4x > 1/3(x + 1)
2. x-2 >= 3+2x
3. x-1/2x >= -1
4. 18-3x <= 11(3 -3x)
5.2(4y-8) >= 3/5(4y -1) |
|
|
|
|
|
|
|
发表于 2-1-2008 03:25 PM
|
显示全部楼层
原帖由 jernkhang 于 2-1-2008 03:17 PM 发表 
大家来练习PMR form3的数学。
expand the follwing expression:
1. 4pq(3p + 13q)
2.-3m(6pn + 8n)
3.x^2(3xy + 2y)
4. -6pq(8pq^2 + 3p -3q)
5.-10xy(3xy -5y^2 +3x^2y)
1. 4pq(3p + 13q)= 12p^2q + 52pq^2
2. -3m(6pn + 8n)= -18mnp - 24mn
3.x^2(3xy + 2y)= 3x^3y + 2x^2y
4. -6pq(8pq^2 + 3p -3q) = -48p^2q^3 - 18p^2q + 18pq^2
5.-10xy(3xy -5y^2 +3x^2y) = -30x^2y^2 + 50xy^3 - 30x^3y^2 |
|
|
|
|
|
|
|

楼主 |
发表于 2-1-2008 03:27 PM
|
显示全部楼层
做graph function
以下题目会用英文出题:
1.given the function y= 2x^2 -7x +3
calculate y when
a. x=2
b. x=-2
c. x=0
d.x=4
2.given the function y = 3/(5 - x)
i)calculate y when
a. x=-7 b. x=0 c.x= 3
ii)calculate x when
a.y=0 b.y=-2 c.y = 4 |
|
|
|
|
|
|
|
发表于 2-1-2008 03:30 PM
|
显示全部楼层
原帖由 jernkhang 于 2-1-2008 03:17 PM 发表 
factorize the folling expression:
1. ax +4bx +2cx
2. 6a - 24c
3.10ab -30a +
4. 4x +3yy
5.ab + bc - ad - cd
1. ax +4bx +2cx = x(a + 4b + 2c)
2. 6a - 24c = 6(a - 4c)
3. ?????
4. ?????
5. ........ |
|
|
|
|
|
|
|
发表于 2-1-2008 03:37 PM
|
显示全部楼层
原帖由 harry_lim 于 2-1-2008 15:30 发表 
1. ax +4bx +2cx = x(a + 4b + 2c)
2. 6a - 24c = 6(a - 4c)
3. ?????
4. ?????
5. ........
5. ab + bc - ad - cd
=b(a+c)-d(a+c)
=(b-d)(a+c) |
|
|
|
|
|
|
|
发表于 2-1-2008 03:39 PM
|
显示全部楼层
|
|
|
|
|
|
|
发表于 2-1-2008 03:46 PM
|
显示全部楼层
|
|
|
|
|
|
|
发表于 2-1-2008 03:53 PM
|
显示全部楼层
expand the following expression:
1. 4pq(3p + 13q)=12p^2q+52pq^2
2.-3m(6pn + 8n)=-18mpn-24mn
3.x^2(3xy + 2y)=3^3y+2yx^2
4. -6pq(8pq^2 + 3p -3q)=-48p^2q^3-18p^2q+18pq^2
5.-10xy(3xy -5y^2 +3x^2y)=-30x^2y^2+50xy^3-30x^3y^2
factorize the following expression:
1. ax +4bx +2cx=x(a+4b+2c)
2. 6a - 24c=6(a-4c)
3.10ab -30a =10a(b-3)
4. 4x +3xy =x(4+3y)
5.ab + bc - ad - cd=b(a+c)-d(a+c)
用手写比较好算
还有这个^弄到我很乱 |
|
|
|
|
|
|
|
发表于 2-1-2008 03:54 PM
|
显示全部楼层
应该是错完了因为我不会算了 |
|
|
|
|
|
|
|
发表于 2-1-2008 03:56 PM
|
显示全部楼层
原帖由 wenyu0705 于 2-1-2008 03:53 PM 发表 
expand the following expression:
1. 4pq(3p + 13q)=12p^2q+52pq^2
2.-3m(6pn + 8n)=-18mpn-24mn
3.x^2(3xy + 2y)=3^3y+2yx^2
4. -6pq(8pq^2 + 3p -3q)=-48p^2q^3-18p^2q+18pq^2
5.-10xy(3xy -5y^2 +3x^2y)=-3 ...
是咯..............我用手写这些power of x的写到怕料......... |
|
|
|
|
|
|
|
发表于 2-1-2008 03:59 PM
|
显示全部楼层
|
|
|
|
|
|
|
发表于 2-1-2008 03:59 PM
|
显示全部楼层
|
|
|
|
|
|
|
发表于 2-1-2008 04:00 PM
|
显示全部楼层
回复 34# 的帖子
电脑打很麻烦 。。。。。。。。。。。。 |
|
|
|
|
|
|
|
发表于 2-1-2008 04:02 PM
|
显示全部楼层
|
|
|
|
|
|
|
发表于 2-1-2008 04:05 PM
|
显示全部楼层
|
|
|
|
|
|
|
发表于 2-1-2008 04:05 PM
|
显示全部楼层
|
|
|
|
|
|
| |
本周最热论坛帖子
|