giúp mình bài E(I,II) với ạ
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HL
0
LH
0
HA
1
DT
Đỗ Thanh Hải
CTVVIP
13 tháng 7 2021
1 If my father didn't smoke too much, he wouldn'e have a bad cold
2 If she were tall enough, she could join the basketball team
3 If I had much time, I would visit my grandparents very often
4 If he knew her address, he could visit her
5 If the bike weren't too small, I could ride it
6 If they had enough money, they would buy the tickets for the concerts
7 If I had a car, I wouldn't have to get up early to catch the bus
8 If Mark were't talkative, people would like him
9 If Ken played football well enough, he would be chosen to be in the school team
10 If Emma read book often, her essays wouldn't be bad
30 tháng 12 2021
a) \(K^I_x\left(CO_3\right)^{II}_y\)
Theo quy tắc hóa trị: x.I = y.II
=> \(\dfrac{x}{y}=\dfrac{II}{I}=\dfrac{2}{1}\)
=> K2CO3
b) \(Fe^{III}_xO_y^{II}\)
Theo quy tắc hóa trị: x.III = y.II
=> \(\dfrac{x}{y}=\dfrac{II}{III}=\dfrac{2}{3}\)
=> Fe2O3
c) \(Al^{III}_x\left(SO_4\right)^{II}_y\)
Theo quy tắc hóa trị: x.III = y.II
=> \(\dfrac{x}{y}=\dfrac{II}{III}=\dfrac{2}{3}\)
=> Al2(SO4)3
d) \(H^I_xS^{II}_y\)
Theo quy tắc hóa trị: x.I = y.II
=> \(\dfrac{x}{y}=\dfrac{II}{I}=\dfrac{2}{1}\)
=> H2S
25 tháng 8 2021
Bài 2:
Ta có: \(3n^3+10n^2-5⋮3n+1\)
\(\Leftrightarrow3n^3+n^2+9n^2+3n-3n-1-4⋮3n+1\)
\(\Leftrightarrow3n+1\in\left\{1;-1;2;-2;4;-4\right\}\)
\(\Leftrightarrow3n\in\left\{0;-3;3\right\}\)
hay \(n\in\left\{0;-1;1\right\}\)
WRITING-I
1.will be used in the future.
2. she lives far from school, she always go to school early.
3.been playing chess for 5 years.
4.of his sickness, he goes to school.