Các bài Luyện tập

ÔN LUYỆN THI HỌC KỲ
MÔN TOÁN LỚP 8
Buổi 1:Những hằng đẳng thức đáng nhớ
I-Lý Thuyết
Các hằng đẳng thức đáng nhớ
7  hằng đẳng thức đáng nhớ :
1)      (A + B)2 = A2 + 2AB + B2
2)      (A – B)2 = A2 – 2AB + B2
3)      A2 – B2 = (A – B)(A + B)
4)      (A + B)3 = A3 + 3A2B + 3AB2 + B3
5)      (A – B)3 = A3 – 3A2B + 3AB2 – B3
6)      A3 + B3 = (A + B)(A2 – AB + B2)
7)      A3 – B3 = (A – B)(A2 + AB + B2)
Bài tập:
Bài 1: Rút gọn:
a, (4x-1)(4x+1)
b, (a2+b2)(a2-b2)
c, (1-x)(1+x)(1+x2)
d, (2a+3c)(4a2-6ac+9c2)
e, (5x-y)(25x2+5xy+y2)
Bài 2:Tính:
Bài 3:Tính:
Bài 4:Tính:
Làm bài kiểm tra
WELCOME TO OUR CLASS
8
Play a game: Pelmanism
be
eat
live
see
eaten
seen
done
do
lived
been
1
3
4
5
6
7
8
9
10
2
I have lived here since last week
UNIT: 7
My neighborhood
Lesson 5: Language Focus
saturday, November 22nd, 2008
Period: 43 / class :86
Unit 7: MY NEIGHBORHOOD Lesson 5: :LANGUAGE FOCUS
I/ Present perfect tense
- For
Since last month
S + have / has + past participle ( V3 / ed )
+ a period of time
- Since
+ a point of time
- For five months
For
Since
(1) …. Five minutes
(2) …. January
(3) …. 1990
(4) … 10 weeks
(5) … Friday
for
Since
since
for
since
- already: rồi
- just: vừa mới
- never: không bao giờ
- ever: chưa bao giờ
yet: chưa
* Usage:
S + have / has +not + past participle ( V3 / ed )
Have / Has + S + past participle ( V3 / ed )…?
EX: I have been here for 10 years
Diễn tả hành động xãy ra ở quá khứ kéo dài đến hiện tại
Form:
Period: 43 / class :86
I/ Present perfect tense
a/ I ……………...here since last week
b/ We………. . .. in that restaurant for two years
c/ I……………… her since yesterday
d/ They……….. … Quang Trung School since last year.
e/ My dad ……………. For this company .
. f/ …….. Ba………. …….stamps since 1995 ?
( live )
( not eat )
( not see )
( attend )
(just work )
( collect )
be
see
been
eat
attended
live
done
do
seen
attend
lived
collect
collected
eaten
have lived
haven’t eaten
haven’t seen
have attended
has just worked
collected
1/ Give the correct form of the verbs in the brackets.
Has
Unit 7: MY NEIGHBORHOOD Lesson 5: :LANGUAGE FOCUS
saturday, November 22nd, 2008
Period: 43 / class :86
long
different
I/ Present perfect tense
large
expensive
same
Unit 7: MY NEIGHBORHOOD Lesson 5: :LANGUAGE FOCUS
Slap the board
saturday, November 22nd, 2008
Period: 43 / class :86
I/ Present perfect tense
EX: Bao is like An
EX: Bao is the same as An
EX: Bao is different from Hau
II/ Comparison with like , (not) the same as , different from, ( not) as+ adj/ adv + as
EX: Bao is not as tall as Hau
…as+ adj + as…
Unit 7: MY NEIGHBORHOOD Lesson 5: :LANGUAGE FOCUS
saturday, November 22nd, 2008
Period: 43 / class :86
1/ Look at the pictures and complete the sentences
I/ Present perfect tense
II/ Comparison with like , (not) the same as , different from, (not) as + adj/ adv+ as.
cheap,long, same, large
a/ The magazine is………….. ……. the newspaper.
same, different, expensive, long
not as large as
b/ Lipton tea is………………… Dilmah tea.
different from
Unit 7: MY NEIGHBORHOOD Lesson 5: :LANGUAGE FOCUS
saturday, November 22nd, 2008
Monday, November 17th, 2008
Period: 43 / class :86
1/ Look at the pictures and complete the sentences
I/ Present perfect tense
II/ Comparison with like , (not) the same as , different from, (not) as+ adj/adv+ as.
 LUCKY NUMBERS
different, expensive, cheap, large, long, same
1
2
3
4
7
6
5
8
Unit 7: MY NEIGHBORHOOD Lesson 5: :LANGUAGE FOCUS
c/ the red dictionary is ……………… the blue dictionary
II/ Comparison with like , (not) the same as , different from, (not) as+adj/adv+ as.
different, expensive, cheap, long, same
not as cheap as
II/ Comparison with like , (not) the same as , different from, as… as.
different, expensive, cheap, long, same
d/ The bag on the left is …………………the bag on the right.
the same as
LUCKY NUMBER !
II/ Comparison with like , (not) the same as , different from, (not) as+ adj/adv+ as.
different, expensive, long, same
e/ The toy cat is……………………….the toy dog.
as expensive as
II/ Comparison with like , (not) the same as , different from, as… as.
different, expensive, modern, long, same
f/ Hoa’s backpack is……………………Lan’s backpack
different from
II/ Comparison with like , (not) the same as , different from, (not)as+ adj/adv+ as.
different, expensive, long, same
g/ The snake is …………………the rope.
as long as
LUCKY NUMBER !
LUCKY NUMBER !
Monday, November 17th, 2008
Period: 43 / class :86
 Complete the conversation. Use the correct form of the verbs in the box. ( 4 / P- 70 )
hope, be (3) , live, see, look, want
Unit 7: MY NEIGHBORHOOD Lesson 5: :LANGUAGE FOCUS
Period: 43 / class :86
I/ Present perfect tense
II/ Comparison with like , (not) the same as , different from, as… as.
III/ Make the sentences. ( 2 sentences in present perfect tense and 2 sentences with comparison you have just learned )
IV/ Homework: - Rewrite 4 sentences in your notebook
- Do exercise 4 on page 70 in text book
- Prepare new lesson
Unit 7: MY NEIGHBORHOOD Lesson 5: :LANGUAGE FOCUS
saturday, November 22nd, 2008
THANKS FOR YOUR ATTENTION
(1) have been
(3) have… lived…
(2) hope
(4) is
(8) have seen
(7) Have… been..
(6) looks
(5) want
Monday, November 17th, 2008
Period: 43 / class :86
@ Complete the conversation. Use the correct form of the verbs in the box. ( 4 / P- 70 )
Unit 7: MY NEIGHBORHOOD Lesson 5: :LANGUAGE FOCUS
hope, be (3) , live, see, look, want