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3 k lun
1. They are _____ armchairs. (a / an / không có)
2. _____ your classmate live near you? (Are / Does / Do)
3. _____ . They are stools. (What's this? / What's it? / What are these?)
4. We live in Ho Chi Minh City. _____ house is on Le Loi Street. (Their / His / Our)
5. How's your father? _____ (He's forty / Very well, thanks / He's a doctor)
1. Ko có
2. Do
3. What are these
4. Our
5. Very well, thanks
a, với n thuộc Z
Để A là một số nguyên thì 3n + 1 chia hết cho n+1
mà n + 1 chia hết n +1
=> (3n+1) - 3. (n+1) chia hết cho n+1
<=> (3n+1)-( 3n +3) chia hết cho n+1
<=> 4 chia hết cho n+1
=> n+1 thuộc Ư(4)= {+-1; +-4; +-2}
nếu ............
1. my brithday is....on......may 15th
2. her brithday party will be ....at.... seven to half past eight ...on.... sunday evething
3 what"s your date ....of.......brith?
4 what your place ....of...... brith?
5 Nam will have a party .....on.....his brithday.....at.......home
6there are forty students .....my class
a) 3 ∈ Z
b) -3 ∉ N
c) 1 ∈ N
d) N ⊂ Z
e) 1;-2 ∈ Z