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\(B1:\)-Ta xát tổng của M
48 chia hết cho 4
20 chia hết cho 4
Ta áp dụng công thức a chia hết cho d;b chia hết cho d;c chia hết cho d
=>a+b+c chia hết cho d
=>Để m chia hết cho 4 thì a cũng phải chia hết cho 4
Để M không chia hết cho 4 thì a phải không chia hết cho 4
\(B2:\)1x2x3x4x5x...x20
=(5x20x4)x1x2x3x...
=400x1x2x3x...
Ta có 400 chia hết cho 400
Ta áp dụng công thức
a chia hết cho b thì a nhân với bất kì số nào cũng chia hết cho b
=>A chia hết cho 400
\(B3:\)Ta có n+10 chia hết cho n+1;n+1 chia hết cho n+1
=>(n+10)-(n+1) chia hết cho n+1
a,(n+10)-(n+1)=9
=>9 là bội của n+1
Ư(9)=(1;-1;3;-3;9;-9)
| n+1 | 1 | -1 | -3 | 3 | 9 | -9 | |
| n | 0 | -2 | -4 | 2 | 8 | -10 |
=.n=(0;-2;-4;2;8;-10
1. A . season , B. building , C. weather , D . banana .
2. A . unload , B . heavy , C shoulder , D. coffee .
3. A. finger , B. kilo , C . chocolate , D . vacation .
4. A. intersection , B. slow down , C . cabbage , D. restaurant .
5. A. address , B. unhappy , C. lovely , D. correct .
1. A new B help C lesson D pencil
2. kitchen children couch machine
1. Sai là week ; sửa thành weak
2. Sai là at ; sửa thành for
4. Sai là doesn't ; sửa thành bỏ từ
6. Sai là is ; sửa thành are
Hang is a gymnast and she is not week.
Lỗi sai:week
Sửa: Hang is a gymnast and she is not weak
.2. My sister often has a glass of milk and some rice at breakfast.
Lỗi sai:at
Sửa: My sister often has a glass of milk and some rice for breakfast.
3. Lan's father doesn't like coffee. He doesn't never drink it .
Lỗi sai: doesn't
Sửa:Lan's father doesn't like coffee. He never drink it . (bỏ chữ doesn't)
. 4. We are listenning to music now.
Lỗi sai:listenning
Sửa:We are listening to music now.
5. There are a lot of milk in the bottle .
Lỗi sai: milk
Sửa:There are a lot of milks in the bottle .
6. Their school is big . They have four floors.
Lỗi sai: They have
Sửa: It has four floors.
1,where were you at these time? write sentences.
a,(Yesterday) I was at home yesterday.
b,(Two days ago) I was at my school two day ago.
c,(Last saturday ) I was at my grandparents' house.
d,( Last summer ) I was on Cua Lo Beach on my vacation last year.
2.write a sentences using each word.
a,( bike ) I go to school by bike.
b,(cry ) Two baby are crying.
c,(blow ) This boy blows the balloon.
d,(blue ) The car is blue.
e,(light ) The light is very beautiful.
h,(room ) My room is on the second floor of the house.
Mk làm xog rùi đấy. Có chỗ nào sai bn góp ý nhé!
bn nhớ chú ý dấu sở hữu cách nha!!!!!!!!
thanks nhiều!!!!!!!!!!!
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