(x+235)+4690=??? x=5643
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M = 1 + (-2 + 3 ) + ( -4 + 5 ) + . . . + (-2000 + 2001) + (-2002) + 2003)
M = 1 + 1+ 1+ . . . + 1 + 1
Dãy số này có 2003 số hạng và có 1001 cặp số có tổng bằng nhau
1001.1+1 = 1002 nên M = 1002
1. How long have you waited for me ?
2. This is the second time I have watched this comedy with my boyfriend
3. I haven't heard from you for ages
4. My boyfriend is the most galant man I have known
5. I have waited for him since 2 p.m
6. He hasn't eaten this kind of food before
7. She is the most warm-hearted woman I have met
8. Have you finished the test yet?
9. I have known him for ages because we were neighbors when I was a child
10. She has teached me English for 3 years
Bài 4: Chia động từ trong ngoặc
1. How long you(wait) for me?
2. This is the second time I (watch) this comedy with my boyfriend.
3. I (not hear) from you for ages.
4. My boyfriend is the most galant man I (know).
5. I (wait) for him since 2 p.m.
6. He (not eat) this kind of food before.
7. She is the most warm-hearted woman I (meet).
8. You (finish) the test yet?
9. I (know) him for ages because we were neighbors when I was a child.
10. She (teach) me English for 3 years.
TL:
4 x 3 x 25 x 19
= (4 x 25) x 3 x 19
= 100 x 3 x 19
= 5700
HT