Chỉ giúp e với ạ em cảm ơn
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Những câu hỏi liên quan
BT
3
DT
Đỗ Thanh Hải
CTVVIP
3 tháng 5 2021
1 Where did you go?
2 Who did you go with?
3 How did you get there?
4 What did you do during the day?
5 Did you have a good time?
MN
3 tháng 5 2021
1. Where did you go?
Where was you going?
2. Who did you go with?
Who was you going with?
3. How did you get there?
How was you getting there?
BT
3
NT
Nguyễn Thị Thương Hoài
Giáo viên
VIP
23 tháng 7 2023
\(\dfrac{1}{1\times2}\) + \(\dfrac{1}{2\times3}\) + \(\dfrac{1}{3\times4}\)+...+\(\dfrac{1}{99\times100}\)
= \(\dfrac{1}{1}\) - \(\dfrac{1}{2}\) + \(\dfrac{1}{2}\) - \(\dfrac{1}{3}\) + \(\dfrac{1}{3}\) - \(\dfrac{1}{4}\) +...+ \(\dfrac{1}{99}\) - \(\dfrac{1}{100}\)
= \(\dfrac{1}{1}\) - \(\dfrac{1}{100}\)
= \(\dfrac{99}{100}\)
DT
Đỗ Thanh Hải
CTVVIP
27 tháng 4 2021
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
DT
Đỗ Thanh Hải
CTVVIP
17 tháng 4 2021
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
LT
1
BT
2
DT
Đỗ Thanh Hải
CTVVIP
27 tháng 3 2021
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) Ta có: \(\sqrt{3x-2}>5\)
nên 3x-2>25
\(\Leftrightarrow3x>27\)
hay x>9
b) Ta có: \(\sqrt{2x-7}< 9\)
\(\Leftrightarrow2x-7< 81\)
\(\Leftrightarrow2x< 88\)
hay x<44
Kết hợp ĐKXĐ, ta được: \(\dfrac{7}{2}\le x< 44\)