một đội công nhân xây dựng đã xây nhà bằng chất vữa gồm xi măng và cát theo tỉ lệ 1;5. Tính sô mét khối xi măng và cát có trong 4500kg vữa ? giúp mik với ạ, mik đg cần gấp
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Nếu x < 2
=> |x - 2| = 2 - x
|x - 3| = 3 - x
|x - 4| = 4 - x
=> |x - 2| + |x - 3| + |x - 4| = 2 (1)
<=> 2 - x + 3 - x + 4 - x = 2
<=> 9 - 3x = 2
<=> x = 7/3 (loại)
Nếu \(2\le x\le3\)
=> |x - 2| = x - 2
|x - 3| = 3 - x
|x - 4| = 4 - x
Khi đó (1) <=> x - 2 + 3 - x + 4 - x = 2
<=> - x + 5 = 2
<=> x = 3 (tm)
Nếu \(3< x\le4\)
=> |x - 2| = x - 2
|x - 3| = x - 3
|x - 4| = 4 - x
Khi đó (1) <=> x - 2 + x - 3 + 4 - x = 2
<=> x = 3 (loại)
Nếu x > 4
=> |x - 2| = x - 2
|x - 3| = x - 3
|x - 4| = x - 4
Khi đó (1) <=> x - 2 + x - 3 + x - 4 = 2
<=> 3x = 11
<=> x = 11/3 (loại)
Vậy x = 3
12. The car drove ______just outside Winchester.
A. away B. off C. down D. in
13. Talks ______last week over the issue of overtime pay.
A. broke in B. broke down C. broke off D. broke away
14. As the funeral service began, Frances ______and cried.
A. broke down B. broke off C. broke in D. broke away
15. Dad would occasionally ______with an amusing comment.
A. broke off B. broke out C. broke up D. break in
16. Someone had ______through the bedroom window.
A. broken up B. broken off C. broken down D. broken in
17. Did you know they’ve ______their engagement?
A. broken off B. broken in C. broken down D. broken out
18. The fire must have ______during the night.
A. broke off B. brought in. C. broken out D. brought down
19. There were suggestions that her involvement had ______the partnership.
A. broken off B. broken up C. broken about D. brought in
20. When do you ______for Easter?
A. break away B. break down C. break up D. break in
TL:
20. When do you ______for Easter?
A. break away B. break down C. break up D. break in
o l m . v n
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Dương Thanh Huyền CTV
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12. The car drove ______just outside Winchester.
A. away B. off C. down D. in
13. Talks ______last week over the issue of overtime pay.
A. broke in B. broke down C. broke off D. broke away
14. As the funeral service began, Frances ______and cried.
A. broke down B. broke off C. broke in D. broke away
15. Dad would occasionally ______with an amusing comment.
A. broke off B. broke out C. broke up D. break in
16. Someone had ______through the bedroom window.
A. broken up B. broken off C. broken down D. broken in
17. Did you know they’ve ______their engagement?
A. broken off B. broken in C. broken down D. broken out
18. The fire must have ______during the night.
A. broke off B. brought in. C. broken out D. brought down
19. There were suggestions that her involvement had ______the partnership.
A. broken off B. broken up C. broken about D. brought in
20. When do you ______for Easter?
A. break away B. break down C. break up D. break in
^H^T