Làm giúp mình câu 12 thôi ạ
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KM
1
DT
Đỗ Thanh Hải
CTVVIP
28 tháng 4 2021
1 My sister has learned English for 5 years
2 A supermarket was built near the airport last year
3 I spent three hours cleaning the house yesterday
6 The wall built three weeks ago fell down
7 Unless you leave me alone, I will call the police
8 The suspects are being followed by the police
10 Nobody in this team is as good at playing football as Tom
PT
GIÚP MÌNH CÂU 4,CÂU 5, CÂU 9, CÂU 11, CÂU 12 VÀ CÂU 15 THÔI Ạ!!
1
DT
Đỗ Thanh Hải
CTVVIP
11 tháng 7 2021
4 If you aren't alert, you computer will be infected with viruses
5 If we use much pesticide on vegetables, they will become poisonous
9 Because Nam needs to improve his social skills, he attends the activity
11 How about using public buses instead of motorbike
12 They enjoy protecting the environment unpolluted
15 Mr Brown was disappointed that his son didn't write to him
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 \(n\in\left\{0;-1;1\right\}\)
they had to work in a quiet office
Cái bài wish mà bạn