S.1 難爆題目,,20點..快入!!!

2010-07-27 9:22 am

1) A rectangular box with dimensions 12cm X 6cm X 6cm is fully filled with sugar cubes. If the length of each side of a sugar cube is1.5cm, find the number of sugar cubes in box.

2)The dimensions of the base of a rectangular tank are 30cm X 50cm and the original depth of water in the tank is 31cm. Tony puts 400 pieces of stones, each of volume 12cm³ , into the tank. Find the new depth of water in the tank.

3)a) Are △PQR and △PNM a pair if similar triangles?If they are , give the reason.
http://vspace.cc/file/TDKDQZM7I2FE2G9B.html
b) Find MN.

4)As shown in the figure, Jack first places a mirror on the ground 36m away from the tree, then he walks backwards until he can view the top of the tree from the mirror. It is
given that the distance between Jack and the mirror now is12m, and x=y . If the eye level of Jack from thegroung is 1.6m, what is the height of the tree?圖:http://vspace.cc/file/KSLORVDVPQ9G8TRP.html

5) In the figure, MONis a straight line. Find d. 圖:http://vspace.cc/file/KSLORVDVPQ9G8TRP.html

6)Find y in the figure. 圖: http://vspace.cc/file/2P14CAOEUKIE3P8H.html

7)In the figure , ADF and CDE are straight lines.
If reflex ∠BCD=285&compfn;, find ∠ACB. 圖: http://vspace.cc/file/U5O3EWL54J841NOG.html

8) In the figure, AB//DE . Find e. 圖: http://vspace.cc/file/CLXG4X61R4QTLMS5.html

9)Increase32 by 5% _____ (Find new value)

10)Decrease 75 by 26% _____(Find new value)

回答 (2)

魔龍帝齊格益力多

2010-07-27 6:23 pm

✔ 最佳答案

(12cm X 6cm X 6cm)/1.5^3
=128
__________________
30cm X 50cmX(Y-31)=400*121500(Y-31)..............=4800Y-31.......................=3.2Y............................=34.2
________________________
Reason:AAA

What is MN?
The tree:
36/12=x/1.6
x......=4.8
_________________

2010-07-27 10:30:36 補充：
3)a) Are △PQR and △PNM a pair if similar triangles?If they are , give the reason.
http://vspace.cc/file/TDKDQZM7I2FE2G9B.html
b) Find MN.

3 sides prop.
__________________________
PQ/PN=QR/MN
18/6....=12/MN
MN......=4
___________________________

2010-07-27 10:33:39 補充：
9)Increase32 by 5% __33.6___ (Find new value)

Decrease 75 by 26% _75____(Find new value)

2010-07-27 10:34:11 補充：
Decrease 75 by 26% _55.5____(Find new value)

2010-07-27 10:39:10 補充：
8) In the figure, AB//DE . Find e. 圖: http://vspace.cc/file/CLXG4X61R4QTLMS5.html
ADD a line FG(FG//AB//DE):

DCG=e(錯角FG/DE)

BCG=2e+30-e
BCG=e+30
______________
ABC+BCG=180(同旁X角AB//FG)
4e-10+e+30=180
e................=32

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用戶10232

2010-07-27 2:20 pm

1. 192cubes

參考: myself

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