Giúp mình làm với ạ mình cần gấp
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Những câu hỏi liên quan
BH
1
DT
Đỗ Thanh Hải
CTVVIP
8 tháng 10 2021
1 How long do you live in HN
2 How often did you go to the movies
3 What did Mrs Robinson buy
4 When was your father in Nghe An
5 How do they go to school
6 Why didn't she go to class
7 Who left home at 7o'clock yesterday
8 What subject does he study in the high school
9 What is your favorite hobby
10 How far is it
NQ
0
giúp mình với ạ , mình đang cần gấp ạ, các bạn làm theo cách kẻ bảng ra giúp mình được không ạ
AH
Akai Haruma
Giáo viên
7 tháng 8 2021
Bài 13:
$6-2\sqrt{5}=5-2\sqrt{5}.\sqrt{1}+1$
$=(\sqrt{5}-1)^2$
Tương tự: $6+2\sqrt{5}=(\sqrt{5}+1)^2$
Do đó:
$M=\sqrt{(\sqrt{5}+1)^2}-\sqrt{(\sqrt{5}-1)^2}$
$=|\sqrt{5}+1|-|\sqrt{5}-1|=(\sqrt{5}+1)-(\sqrt{5}-1)$
$=2$
AH
Akai Haruma
Giáo viên
7 tháng 8 2021
Bài 14:
a.
$M=\sqrt{4+2\sqrt{4}.\sqrt{5}+5}-\sqrt{4-2\sqrt{4}.\sqrt{5}+5}$
$=\sqrt{(\sqrt{4}+\sqrt{5})^2}-\sqrt{(\sqrt{4}-\sqrt{5})^2}$
$=|\sqrt{4}+\sqrt{5}|-|\sqrt{4}-\sqrt{5}|$
$=2+\sqrt{5}-(\sqrt{5}-2)=4$
b.
$N=\sqrt{7-2\sqrt{7}+1}-\sqrt{7+2\sqrt{7}+1}$
$=\sqrt{(\sqrt{7}-1)^2}-\sqrt{(\sqrt{7}+1)^2}$
$=|\sqrt{7}-1|-|\sqrt{7}+1|$
$=(\sqrt{7}-1)-(\sqrt{7}+1)=-2$
H
2
bạn nào làm giúp mình với ạ mình cần gấp lắm ^^
DT
Đỗ Thanh Hải
CTVVIP
13 tháng 7 2021
1 Ann is very upset because the local authorities have turned down her proposals to install solar panels to supply electricity for traffic lights
2 A committe has been set up to examine the question
3 Our class football team lost the match, so we tried to cheer them up
4 "Can I wear jeans at wedding party?" - "Of course not. You'll have to cover up smart clothes"
5 Before I come to a decision, I'll have to think over their offer very carefully
KY
13 tháng 7 2021
Ann is very upset because the local authorities have turned down her proposals to install solar panels to supply electricity for traffic lights
A committe has been set up to examine the question
Our class football team lost the match, so we tried to spirit them up /cheer them up
"Can I wear jeans at wedding party?" - "Of course not. You'll have to cover up smart clothes"
Before I come to a decision, I'll have to think over their offer very carefully
was
was
were
were
wasn't
weren't
was
was
remembered
ate
had
did she not buy
didn't talk
did they not come
did-go
went
tách ra 1 câu hỏi 10 câu thôi c:v