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Ta có : |y - 2017|\(\ge0\forall y\in R\)
Nên A = |y - 2017| + 2018 \(\ge0+2018\forall y\in R\)
<=> A = |y - 2017| + 2018 \(\ge2018\forall y\in R\)
Vậy Amin = 2018 khi |y - 2017| = 0 <=> y - 2017 = 0 <=> y = 2017
GTNN=2018
ta thay vay nha
|y-2017| phải có giá trị nhỏ nhất mà ta biết giá trị nhỏ nhất của nó là =0
do |y-2017|+2018=0+2018=2018
cau duoi =2
43. Be careful! That bike (break)..........is breaking................. 44. Lan likes (play)..............playing.........games on computer. 45. He ia tall enough (play)..............to play............basketball. 46. When I was a child, I (study)........studied................hard 47. I (live)...............have lived..............here since last week 48. They (know).........have known..............each other for four years 49. My sister loves (read)...........reading...............in her free time. 50. My sister is old enough (drive).........to drive.............a car.
45. I am preparing for the picnic .................my friends tomorrow.
A. at B. to C. in D. with
46. Kangaroos, which come .................Australia, have long tails.
A. to B. in C. from D. for
47. Mount PinaTubo, ..................is a volcano in the Philippines, erupted in 1991.
A. which B. who C. whom D. whose
48. We ...............since we left school.
A. don't meet B. didn't meet C. won't meet D. haven't met
49. In 1995, a huge earthquake ................the city of Kobe in Japan.
A. strike B. struck C. striking D. striked
50. I can't hear what you are saying. Can you................the radio?
A. turn on B. turn off C. turn up D. turn over
51. Neil Armstrong, .................walked on the moon, lived in the USA.
A. which B. whom C. who D. whose
52. UFOs mean ................flying objects.
A. unknown B. unidentified C. unable D. unimaginary
53. There is no ..................that he has been here.
A. evident B. evidential C. evidentially D. evidence
54. Do you think you will be able ................a space trip?
A. take B. to take C. talking D. taken
55. If I ..............a bird, I would be a drove.
A. am B. is C. are D. were
56. If we became rich, we would travel .................the world.
A. on B. in C. at D. around
57. She would come to see you if she .................your address.
A. have B. has C. had D. having
58. Where will you go if you ................a car?
A. have B. has C. had D. having
59. Where would you go if you .................a car?
A. have B. has C. had D. having
60. This test must be done....................
A. carefully B. care C. careful D. careless
Viết sai từ Goodbike rồi , phải là goodbye chứ
Ngu Tiếng Anh
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Yên tâm
Việt Nam bắt buộc phải thắng vì nếu không thắng đươc thì cơ hội càng khép lại .Việt Nam vô định, Việt Nam vô định lạy, lạy, lạy
nhớ cho nhiều quả đúng nha.
mik vừa kéo xuống và.......................................
đậu xanh lại mất thêm 30 giây
3564+478=4042
6462-45=6417
3564+478=4042
6462-45=6417
chuc bn hok tot nha