Cần gấp giúp với !
Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
1 do you do
2 had done - went
3 went - had read
4 will attend
5 hadn't worn
6 to be
7 weren't sleeping - were playing
8 to be
9 had lived - moved
10 locking
11 had work - retired
12 told - had learned
13 won't call
14 had met
do you do
had done-went
went- had read
will attend
hadn't worn
to be
![](https://rs.olm.vn/images/avt/0.png?1311)
12.2 cắt quá bạn đăng lại nhé
13
\(n_{Al}=\dfrac{10,8}{27}=0,4\left(mol\right)\)
a.
\(2Al+6HCl\rightarrow2AlCl_3+3H_2\)
0,4->1,2----->0,4-------->0,6
\(V_{H_2}=0,6.22,4=13,44\left(l\right)\)
b. \(C\%_{HCl}=\dfrac{1,2.36,5.\left(100+20\right)\%}{200}=26,28\%\)
c. \(n_{HCl.dư}=(\dfrac{200.26,28\%}{100\%}:36,5)-1,2=0,24\left(mol\right)\)
\(C\%_{HCl.dư}=\dfrac{0,24.36,5.100\%}{10,8+200-0,6.2}=4,18\%\)
\(C\%_{AlCl_3}=\dfrac{0,4.133,5.100\%}{10,8+200-0,6.2}=25,48\%\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a: Xét tứ giác AEHF có
\(\widehat{AEH}=\widehat{AFH}=\widehat{FAE}=90^0\)
Do đó: AEHF là hình chữ nhật
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
1 were - would you play
2 weren't studying - would have
3 had taken - wouldn't have got
4 would you go - could
5 will you give - is
6 recycle - won't be
7 had heard - wouldn't have gone
8 would you buy - had
9 don't hurry - will miss
10 had phoned - would have given
11 were - wouldn't eat
12 will go - rains
13 had known - would have sent
14 won't feel - swims
15 hadn't freezed - would have gone
![](https://rs.olm.vn/images/avt/0.png?1311)
b) Áp dụng hệ thức lượng trong tam giác vuông vào ΔAHB vuông tại H có HM là đường cao ứng với cạnh huyền AB, ta được:
\(AM\cdot AB=AH^2\)(1)
Áp dụng hệ thức lượng trong tam giác vuông vào ΔAHC vuông tại H có HN là đường cao ứng với cạnh huyền AC, ta được:
\(AN\cdot AC=AH^2\)(2)
Từ (1) và (2) suy ra \(AM\cdot AB=AN\cdot AC\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\left(2119-x\right)\cdot2,23=174\)
\(\Rightarrow219-x=\frac{174}{2,23}\)
\(x=219-\frac{174}{2,23}\)
Câu hỏi đâu rồi em?
Nó bị lỗi ko lên hình =((