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Những câu hỏi liên quan
TT
2
TT
2
DT
Đỗ Thanh Hải
CTVVIP
25 tháng 5 2021
Đề dài thế này sao giải thích nhanh cho e đc
Part 1
1 C
2 B
3 D
4 C
5 B
6 A
Part 2
1 T
2 F
3 F
4 F
V
1 That old house has just been bought
2 If he doesn't take these pills, he won't be better
3 I suggest taking a train
4 Spending the weekend in the countryside is very wonderful
TT
2
DT
Đỗ Thanh Hải
CTVVIP
24 tháng 5 2021
1 The meeting was canceled 3 days ago
2 She told me she was watching a film with her sister then
3 I admire the guitarist who is perfroming on the stage
4 Had it not been for Pauline's interest, the project would have been abandoned
NH
1
30 tháng 4 2023
1: (x-1)^2+(y+2)^2=25
=>R=5; I(1;-2)
2: Δ'//Δ nên Δ': 3x-4y+c=0
d(I;Δ')=5
=>\(\dfrac{ \left|3\cdot1+\left(-2\right)\cdot\left(-4\right)+c\right|}{\sqrt{3^2+\left(-4\right)^2}}=5\)
=>|c+11|=25
=>c=14 hoặc c=-36
=>3x-4y+14=0 hoặc 3x-4y-36=0
3x-4y+14=0
=>VTPT là (3;-4) và (Δ') đi qua A(2;5)
=>VTCP là (4;3)
=>PTTS là x=2+4t và y=5+3t
3x-4y-36=0
=>VTPT là (3;-4) và (Δ') đi qua B(0;-9)
=>VTCP là (4;3)
PTTS là x=0+4t và y=-9+3t
KY
3 tháng 8 2021
He asked me to know what the time was.
She asked me when we would meet again.
She asked him If he was crazy.
He asked me to know when they had lived.
He asked her If she would be at the party.
She asked me If I could meet her at the station.
The teacher asked me to know who knew the answer
She asked him to know why he didn't help her.
He asked me If I had seen that car.
The mother asked the twins If they had tidied up their room.
Tom asked how much that computer was
LT
3 tháng 8 2021
11. what the time was.
12. when they would meet again.
13. if he was crazy.
14. where they had lived.
15. if she would be at the party.
16. if I could meet her at the station.
17. who knew the answer.
18. why I didn't help her.
19. if I had seen that car.
20. if they had tidied up their room.
Bài 3:
asked how much that computer was.
19 tháng 9 2021
Ta có: \(\left\{{}\begin{matrix}p+e+n=52\\p=e\\n-p=1\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}p=e=17\\n=18\end{matrix}\right.\)
KN
1
S
2 tháng 4 2022
Câu 2 :
a) PTHH : \(2Al+3S-->Al_2S_3\)
\(Zn+S-->ZnS\)
mS = 29,55 - 15,15 = 14,4 (g)
b) nS = 14,4/32 = 0,45 (mol)
PTHH : \(Al_2S_3+3H_2SO_4-->Al_2\left(SO_4\right)_3+3H_2S\)
\(ZnS+H_2SO_4-->ZnSO_4+H_2S\)
\(H_2S+2AgNO_3-->Ag_2S+2HNO_3\)
Bảo toàn S : nAg2S = nH2S = nS = 0,45 (mol)
=> mktAg2S = 111,6 (g)
c) PTHH : \(H_2S+CuCl_2-->CuS+2HCl\)
nH2S = 0,45/2 = 0,225 (mol)
Theo pthh : nCuS = nH2S = 0,225 (mol)
=> mCuS = 0,225.96 = 21,6 (g)
1me where her umbrella was
2how we were
3me if he had to do it
4where she had been
5which dress he liked best
6what they were doing
7if i was going to the cinema
8who spoke E
9how i knew that
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