maths~教教我....

[color=Sienna]1.Shop A sells a cup for $x and a plate for $y. If Mr Chan pays $150 to buy 4 cups and 8         plates,  express the change in terms of x and y.[/color]

[color=Magenta]2.Mary bought a book and read 3/8 on the first day. On the second day, she read 1/3 of the REST and 30 pages remained finally. How many pages are there in the book?[/color]

[color=DarkSlateBlue]3.1,3,4,7,11,_,_,_[/color]

[color=DeepSkyBlue]4.0,1/2,2/3,3/4,4/5[/color]

[color=Purple]5.分數:6/11轉百分數和小數(小數後2位)[/color]

[color=YellowGreen]6.黃先生以$500買橙20打,以每個$3.5售出80个,再以每个$1售出餘下的橙,求虧蝕百分率。[/color]

[color=Orange]7.If the distance between M(2a+1,1) and N(5-3a,1)is 7 units, find the possible values of a.[/color]

[color=Navy]8.Find two consecutive integers such that 3/5 of the larger number exceeds 1/4 of the smaller one by 5又1/2.[/color]

[color=YellowGreen]9.Sam pays $154 for 2 T-shirts and 4 pairs of socks . If the price of each pair of socks is 1/5 of each T-shirts ,find the price of a T-shirts.[/color]

[color=Red]10.The number of rotten apples is 3/14 of the total number of apples. If 4 more rotten apples are added, the number of rotten apples will be 1/4 of the total number of apples.How many apples are there originally?[/color]

[[i] 本帖最後由 Heib 於 2007-8-16 02:52 PM 編輯 [/i]]

1.4x+8y=150
        4x=150-8y
         x=4分之150-4分之8y
         x=37.5-2y

2.[1-(8分之3+8分之5乘3分之1)]分之30
=1-(8分之3+24分之5)分之30
=1-(24分之9+24分之5)分之30
=1-24分之14分之30
=24分之24-24分之14 分之30
=24分之10分之30
=3乘24
=72

3.18,29,47

4.n分之n-1

5.  0.55

6.-$500+[$3.5乘80+$1乘(20乘12-80)
----------------------------------------------------------乘100%
                    $500
        -$60
=-------------乘100%
        $500

=-12%

7-10未做..
sor= =..

回覆 #3 ●siu_y_an§ 的帖子

唔緊要la,,,你已經幫了我很大忙.....不過,,,我仲有好多唔識~

[color=Red]1.某件衣服的成本為$60,若以25%的折扣售出,盈利是35%,求該件衣服的標價。[/color]


[color=DarkOrange]2.李先生把收音機的標價定為$320以圖獲利60%。後來於大減價中,收音機以20%的折扣售出,求李先生最後的盈利百分率。[/color]

[color=Magenta]3.What's the relation between the numbers of vertices(V), edges(E) and faces(F) of a solid ?[/color]

[[i] 本帖最後由 Heib 於 2007-8-21 10:02 AM 編輯 [/i]]

1.($60乘35%+$60)
--------------------------------
     1-25%
   ($21+$60)
=------------------
       75%
     $81
=-----------
     75%

=$108

2.320乘(1-20%)-(1+60%分之320)
--------------------------------------------------乘100%
     (1+60%分之320)
   
         320乘80%-200
=--------------------------------乘100%
             200
        256-200
=------------------------乘100%
         200
     56
=-------乘100%
   200

=28%

3.v-e+f=2

謝嚕~//