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1 Facsimile was invented by Alexander Bain
2 Ha Long Bay was recognized as one of the world's seven wonders
3 Can garbage be used to make compost?
4 Romeo and Juliet was written by Shakespeare in 1592
5 Did the Wright brothers build the first plane in 1903?
6 Our factory doesn't produce this kine of paper
7 People have used ball point pens for many years
7 Whitcomb L.Judsin invented the zipper in 1893
1 about - in
2 In - to
3 from - of - in
4 in - at - during
5 in - on
6 about
7 from
8 as
9 by - in - in
10 to - in
1 stilt houses
2 speciality
3 diverse
4 unique
5 folk dances
6 costume
7 heritage site
8 ornaments
9 terraced fields
10 ethnic minorities
XI
1 That book was published a few years ago
2 The magazines are put on the shelf in the corner
3 These toys are sold on Disneyland and in Hong Kong
4 My house was built in 2001
5 This computer was made in China
6 These old clothes are collected for the poor children.
7 This reports had been finished by five o'clock
8 Nam said he would attend the lecture last night
a) 900 cm² = 0,9 m²
Diện tích căn phòng:
9 × 4 = 36 (m²)
Số viên gạch cần dùng lát kín căn phòng:
36 : 0,9 = 40 (viên)
b) Số tiền mua gạch:
40 : 5 × 20000 = 160000 (đồng)
a: Xét ΔAMN và ΔCDN có
NA=NC
\(\widehat{ANM}=\widehat{CND}\)
NM=ND
Do đó: ΔAMN=ΔCDN
b: Xét tứ giác AMCD có
N là trung điểm của AC
N là trung điểm của MD
Do đó: AMCD là hình bình hành
Suy ra: CD//AM
hay CD//AB
Bài 2:
\(b,=\left(x+y\right)^2+2\left(2x-y\right)\left(x+y\right)+\left(2x-y\right)^2-4x^2+4xy-y^2-x^2+y^2\\ =\left(x+y+2x-y\right)^2-5x^2+4xy\\ =9x^2-4x^2+4xy=5x^2+4xy=x\left(5x+4y\right)\)
1.to meet
2.to see
3.not to touch
4.to lock-going
5.not to speak
6.to explain-to listen
7.to know
8.to disguise-dressing
9.to wait
10.to inform
11.to smoke
12.to persuade-to agree
13.to make-rubbing
14.to start-looking
15.going
16.to show-to use
17.to have-writing
18.to answer-replying
19.to explain-to listen-grumbling
20.to start-to wait
tr ạ,làm gần xog r ấn nút tắt tab:v