Bài câu điều kiện giúp mình vs ạ.
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6 tháng 11 2023
\(19.\\ a)n_{Mg}=\dfrac{2,4}{24}=0,1mol\\ Mg+H_2SO_4\rightarrow MgSO_4+H_2\\ n_{H_2}=n_{H_2SO_4}=n_{Mg}=0,1mol\\ V_{H_2}=0,1.22,4=2,24l\\ b)m_{ddH_2SO_4}=\dfrac{0,1.98}{10}\cdot100=98g\)
9 tháng 12 2023
Bài 1:
\(a=12+15+21+x=x+57\)
\(a⋮3\)
=>\(x+57⋮3\)
mà \(57⋮3\)
nên \(x⋮3\)
\(a⋮̸3\)
=>\(x+57⋮̸3\)
mà \(57⋮3\)
nên \(x⋮̸3\)
Bài 2:
\(A=75+1205+2008+x\)
=>\(A=x+3288\)
Để A chia hết cho 5 thì \(x+3288⋮5\)
mà \(3288\) chia 5 dư 3
nên x chia 3 dư 2
=>\(x=3k+2\left(k\in N\right)\)
đề bài câu điều kiện loại 1 giúp mk với ạ
DT
Đỗ Thanh Hải
CTVVIP
19 tháng 7 2021
1 study - will pass
2 shines - will walk
3 has - will see
4 come - will be
5 earns - will fly
6 travel - will visit
7 wear - will slip
8 forgets - will give
9 go - will listen
10 wait - will ask
11 eat - will have
12 needs - will give
13 have - will meet
14 will talk - don't want
15 won't win - don't know
NT
1
DT
Đỗ Thanh Hải
CTVVIP
10 tháng 7 2021
44 If I had known your name, I could have introduced you with my friends
45 If the driver in front hadn't stopped so quickly, the accident wouldn't have happened
46 If I had known Geogre wanted to get up early, I would have waken him
47 If Jim hadn't lent me the money, I wouldn't have been able to buy the motorbike
48 If she hadn't been wearing the seat belt, she wouldn't have injured (câu này sao ta)
49 If she had had enough money on her, she would have bought the coat
50 If....(tên ai đó) hadn't gone to the bus stop in time, she would have late for the interview
51 If.......hadn't recommened the hotel to us, we wouldn't have stayed at this hotel
52 If you had had breakfast, you wouldn't be hungry now
HV
19 tháng 11 2021
7 Tim told me if I didn't have a degree, I couldn't get a job easily
8 I told Martin he could sleep well at night, if he didn't drink too much coffee
9 Jim told Daise unless she chooses the words more carefully, she would be introuble
10 I said to Dick I would forget Ann's birthday if he didn't remind me
11 Jim told Jane he wouldn't have been late for his intervire if he hadn't missed the train
12 I told my friends if it didn't rain that morning, we could go for a picnic
13 I said if Linda had been at home the day before, I could have visited her
14 They said if the weather were nice that day, they would go to the zoo
9 tháng 12 2021
a: Xét tứ giác ABHK có
\(\widehat{AHB}=\widehat{AKB}=90^0\)
Do đó: ABHK là tứ giác nội tiếp
1 were - would know
2 had studied - would have passed
3 throw
4 were - would tell
5 had had - would have taken
6 have - will give
7 wouldn't have got - had remembered
8 would change - were
9 is
10 had - wouldn't have to