MATHS; chapter review .
-Congruency and similarity
-triangles and quadrilaterals
-algebra manipulation
-linear equation
-Rate and speed
-pythagorus therom
-functions and graph
- prism and cyclinder
ehhs , think i shall psot th algebra thingy first . cause mostly of them dunno how to do .
e.g. -- 3x + 5x = 8x
1/5 + 3/5 = 4/5m
11/7a + 4/3a = 33/21a + 28/21a = 61/21 = 2/19/21
*th denorminator must be th same , and so in order to be th same you have to times >> 7*3 , 3*7
denn th denorminator you will get 21 , denn th norminator which is th upper part , oso nid to times .
denn after times all it will get >> 33/21a + 28/21a denn you plus and get th ans of , 61/21 , so you round off to th smallest number so become >> 2/19/21 .
2a + 3+ 6a + 5 = 2a + 6a + 3 + 5 = 8a + 8 .
7m + 4 + 3m + 1 = 7m + 3m + 4 + 1 = 10m + 5.
* Sati spends 2H + 1 dollars on toys and 3H + 2 on computer games. how much does she spend altogether?
Solution.
(2H+1) + (3H+2) = 2H + 3H + 1 + 2 = 5H + 3 .
p+5 = 7
p= 7-5
p= 2 .
x+8=10
x=10-8
x=2
2a+2=10
2a=10-2
2a=8
a=8/2 = 4
* in order jus to find th a , you have to take 8/2 .
7x+2=3
7x=3-2
7x=1
x=1/7 .
3w+12=4
3w=4-12
3w=-8
w=(-8)/3
w=(-2)/2/3 .
3(p+2q) - 2(p+13q)
= [3p+(3*2q)] - {2p+(2*13q)]
=(3p+6q) - (2p+26q)
=3p+6q-2p+26q
=3p+6p-26q-6q
=9p-20q .
6(m+2n) + 2(m-2n)
=[6m+{6*2n)] + [2m-(2*2n)]
=(6m+12n) + (2m-(4n)
=6m+12n+2m-4n
=8m+8n .
3(k+4) =15
3*(k+4)=15
(k+4)=15/3
k-4=5
k=5-4
k=1 .
4(a-7)=20
4*(a-7)=20
(a-7)=20/4
a-7=5
a=5+7
a=12 .
* hope you all understand larhhs hors . i know its abit complicated but at least try to understand larhhs hors . ;X
Simple interest (formular)
- original amt * Rate * No of yrs/ 100
Compound interest : go draw box yourself . :D
year , pricipal , interest , compound interest . >> this is wat you nid to put in th box . denn find th thing lorhhs
Speed and rate .
if you wanna find th distance it is >> speed * time
if you wanna find th speed it is >> distance/time
if you wanna find th time it is >> distance/speed .
denn wanna find th average speed >> total distane travelled / total time taken .
Surface area of th cyclinder = sum of the areas of all tis faces .
=2pie r*h + 2*pie r sqaure
=2pie r h + 2pie r square
P/S : hope you know wat im riting about larhhs hors . sorry uhhs .
--r = radius -- h= height
volume of a cyclinder= area of cross-section * height = area of circle * height = pie r sqaure h .
th pythagorus is like you nid to find th side whr they put an alphabet tere .
th longest side is th hypotenus . :D
grahps - use your hand and ruler and pencil to draw :DD
andand dont forget , !!!
bring your ruler ,
your mathematical set ,
your earaser ,
your calculator ,
bring your brain also . :D
hheheees .
ehhs , think stop posting here , any doubts come find ask me now .!
GOOD LUCK FOR MATHS !