minh can gap a
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B7 chu vi mảnh vườn là 3,3 m
diện tích là \(\dfrac{8}{7}\)m vuông
Bài 7:
Chu vi là:
\(\left(\dfrac{12}{5}+\dfrac{10}{21}\right)\cdot2=\dfrac{604}{105}\left(m\right)\)
Diện tích là:
\(\dfrac{12}{5}\cdot\dfrac{10}{21}=\dfrac{8}{7}\left(m^2\right)\)
4 has not been - broke
5 did you - was
6 have youy ever been
II
1 go
2 were
3 eats
7 does - won't worry
8 had played - would have won
9 will - do
10 were - would go
14 would have written
15 won't go
16 tries
17 spoke
19 finish - will go
20 see - ask
Rewrite
1 The man who doesn't work hard can't earn more money
3 If my friend and I had enough money, we would buy a house of our town
4 If the weather were better now, we could go for a walk
5 If I knew his addres, I would give it to you
6 If he worked slowly enough, he wouldn't make
7 If I were sent to proson, she would visit me
8 If I won a big prize in a lottery, I would give up my job
9 If the doctor weren't so late, he could see many patients
10 If tickets weren't expensive, we would visit them in Ha Noi
III
1 were
2 would visit
3 would give
I have been sleeping for 3 minutes
Tôi đã ngủ được 3 tiếng rồi
S+have been+Ving => làm gì đó được bao lâu/từ lúc nào
Bài 4:
\(P=\dfrac{x^2-2x+2022}{x^2}=\dfrac{2022x^2-2.2022x+2022^2}{2022x^2}=\dfrac{\left(x^2-2.2022x+2022^2\right)+2021x^2}{2022x^2}=\dfrac{\left(x-2022\right)^2}{2022x^2}+\dfrac{2021}{2022}\ge\dfrac{2021}{2022}\)\(P_{min}=\dfrac{2021}{2022}\Leftrightarrow x=2022\)
A = 0,5 + 1 + 1,5 + 2 + ... + 10
Số số hạng của dãy số A :
( 10 - 0,5 ) : 0,5 + 1 = 20 (số hạng)
Tổng của dãy số A là :
( 10 + 0,5 ) x 20 : 2 = 105
=))
A= (0,5+1,5)+(1+9)+(2+8)+(3+7)+(4+6)+(5+10)
A= 2+10+10+10+10+15
A= 12+10+10+10+15
A= 22+10+10+15
A= 32+10+15
A= 42+15
A= 57
bạn tìm bán kính của miêng nón bằng cách như sau:
62,8: 3,14 :2 =10( cm)
gòi sau đó bn tính dịn tích bằng:
10 * 10 * 3,14= 314(cm2)
( * là nhân nhé bn) đúng thì tích cho mik nha)))
cảm ơn
Bạn tính diện tích là xong