Sometimes I joke
Với lại đây là chuyên mục toán mà.
Sometimes I joke
Với lại đây là chuyên mục toán mà.
Complete the sentences
1 Minh/often/speak/English/as/good/I/do.
Help me do my homework !
M có phải là số chính phương không nếu : M = 1 + 3 + 5 + ..... + ( 2n - 1 ) ( Với n \(\in\) N, n \(\ne0\) )
Can you help me ?
Chia động từ
1. When I got home I found that water ..... down the kitchen walls.(Run)
2. After he ...... his English course, he went to England to continue his study. (finish)
3. How .......since we ....... college
A. are you - left
B.were you - left
C. have you been - have left
D. have you been - left
4. I .... much of you lately. We ....... three months ago.
A. haven't seen-last meet B. didn't see-met C. haven't seen - have meet D. didn't see - have met
5. The Chinese ...... spaghetti dishes for a long time before Marco Polo ..... back to Italy
A. Made-brought B. Have made-brought C. made - havd brought D. had been making-brought
6. When I arrived at the meeting the first speaker ..... speaking and the audience ........
A. just finished-were clapping
B. had just finished-had clapped
C. had just finished-were clapping
D. just finished-had clapped
7. He ..... his job last month and then he.........out of work
A. lost-was B. was lost-had been
C. has lost-was D. lost-have been
8. In the last hundred years, travelling ...... much easier and more comfortable ( become )
9. In the 19th century, iit ...... two or three months to across North America by covered wagon.
( take)
10. In the past, the trip ...... very rough and often dangerous , but things ..... A great deal in the last hundred and fifty years.
A. was-have changed
B. is-change
C. had been-will change
D. has been -changed
Điền vào chỗ trống
, ,
, .
Viết các tập hợp sau bằng cách liệt kê các phần tử:
a) A = {x ∈ N 12 < x < 16};
b) B = { x∈ N* x < 5};
c) C = { x ∈ N 13 ≤ x ≤ 15}
Cho hai số nguyên a và b (b ≠ 0). Chứng tỏ rằng các cặp phân số sau đây luôn bằng nhau:
a) và b) và .
a) |x+5|+3=7
b)25-|x|=10
Can you help me?Fast nhé
Thank you very much
Thay tỉ số giữa các số hữu tỉ bằng tỉ số giữa các số nguyên
a) 2,04: (-3,12)
b)
c)
d)
Tìm số tự nhiên x, biết rằng:
x 12, x 21, x 28 và 150 < x < 300.
lam ro ra nha