Một tàu thủy vận chuyển 250 tấn thóc và gạo, trong đó có \(\frac{3}{5}\)là số tấn gạo, còn lại là thóc, tính số tấn thóc.
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\(\frac{3.21}{14.15}=\frac{3.3.7}{2.7.3.5}=\frac{3}{2.5}=\frac{3}{10}\)
\(\frac{3\cdot21}{14\cdot15}\)
\(=\frac{3\cdot3\cdot7}{2\cdot7\cdot3\cdot5}=\frac{3}{2\cdot5}=\frac{3}{10}\)
Ý bạn đề như vậy à???
Số học sinh giỏi là :
45 x 1/5 = 9 ( học sinh ) ( Đổi : 20% = 1/5 )
Số học sinh khá là :
45 x 4/9 = 20 ( học sinh )
Số học sinh trung bình là :
45 - 9 - 20 = 16 ( học sinh )
số hs giỏi là
45 . 20%=9 hs
số hs khá là
45. 4/9 = 20 hs
số hs trung bình là
45 -( 9+ 20)= 16 hs
vậy có 9 hs giỏi
20 hs khá
16 hs trung bình
bài này mk ms lm hồi chiều ko sợ sai đâu
Số học sinh xếp loại hạnh kiểm tốt là :
\(42.\frac{5}{7}=42:7.5=30\)( học sinh )
Số học sinh xếp loại hạnh kiểm khá là :
\(42-30=12\)( học sinh )
Đáp số : 12 học sinh
\(\frac{9}{10!}+\frac{9}{11!}+...+\frac{9}{1000!}\)
\(=\frac{10-1}{10!}+\frac{11-2}{11!}+...+\frac{1000-991}{1000!}\)
\(=\frac{10}{10!}-\frac{1}{10!}+\frac{11}{11!}-\frac{1}{11!}+...+\frac{1000}{1000!}-\frac{1}{1000!}\)
\(=\frac{1}{9!}-\frac{1}{10!}+\frac{1}{10!}-\frac{1}{11!}+...+\frac{1}{999!}-\frac{1}{1000!}\)
\(=\frac{1}{9!}-\frac{1}{1000!}< \frac{1}{9!}\left(đpcm\right)\)
Câu 1 : Circle the words that are pronounced differently from the rest:
1. A. lead B. great C. seat D. eat
2. A. so B. show C. who D. though
3. A. think B. thank C. that D. three
4. A. door B. zoo C. fool D. soon
5. A. worry B. sorry C. come D. ton
6. A. easy B. dear C. meat D. seat
7. A. bed B. decide C. get D. general
8. A. early B. weather C. heavy D. head
9. A. one B. song C. sorry D. long
10. A. teachers B. thanks C. pupils D. farmers
Câu 2 : Select response well correctly first in each of questions following:
1. One of them .................an oval face.
A. have B. having C. has D.had.
2. ...........is she? _She is my friend.
A. What B. How C. Who D. Whose.
3. I love fruit. I .............very much.
A. carrots B. tomatoes C. peas D.apples.
4. There is .................... bread on the table.
A. a B. an C. some D. two.
5. Their cows produce ..................
A. a lot of milk B. many milk C. lots milk D. a few milk
6. We are polluting the air .................gases.
A. by B. with C. at D. of.
7. What's his job ?- He's a ...............He s working with children .
A. teacher B. engineer C. farmer D. doctor
8. How often do you visit your grandparents ?
A. one a week B. once a week C. two week D. twice week
9. Can I help you ? - ......................, thanks.
A. No B. Yes C. Sir D. Oh
10. Thanh is going ................. a new bicycle next week.
A. to buy B. buying C. to buying D. buy
Câu 3 : Reorder the words to make meaningful sentences:
1. front / house / the bookstore / of / my / is / in ->............In front of my house is the bookstore...............
2. to / the / don’t / play / they / in / morning / tennis / want ->...........They don't want to play tennis in the morning...............
3. bookstore / how often / you / the / go to / do? ->...............How often do you go to the bookstore?...............
4. goes / usually / to / my brother / by / school / bike ->..............My brother usually goes to school by bike................
5. to work / she / how / travel / does / morning / every?...............How does she travel to work every morning?...............
6. is / travel to / sister / going to / my / Da Lat / next summer. ->...........My sister is going to travel to Da Lat next summer.............
7. fall / the / what / weather / is / the / in / ? ->............What is the weather in the fall?..............
8. prace / you / every day / should / speaking / English...........You should prace speaking E. everyday..............
9. have to / because / is / I / home / raining / stay / it / at................I have to stay at home because it is raining.............
10. your / must / before / you / homework / school / do / going to............You must do your homework before going to school..............
Câu 4 : Make questions for the underlined parts:
1. He often does his homework in the evening.
-> ..........What does he often do in the evening?................................................................................................................
2. She is pracing the piano
-> ........................What is she pracing?.................................................................................................
3. I usually play soccer after school
-> .......................When do you usually play soccer?....................................................................................................
4. We are going to stay there for a week.
-> ..............................How long are you going to stay there?.............................................................................................
5. Minh goes swimming three times a week.
-> .............................How often does Minh go swimming?................................................................................................
6. My father goes to work six days a week.
-> ...........................How often does your father go to work?...............................................................................................
7. Hoa's school is on Le Loi street.
-> ..........................Where is Hoa's school?................................................................................................
8.Yes, she walks to school every day.
-> ...............................Does she walk to school every day?............................................................................................
9. My father usualy takes a shower in the morning.
-> ..............................What does your father do in the morning?................................................................................................
10. They are listening to music at the moment.
-> ....................................What are they doing at the moment?.......................................................................................
Số tấn gạo là :
250 : 5 x 3 = 150 ( tấn )
Số tấn thóc là :
250 - 150 = 100 ( tấn )
Đ/S : .....
Số tấn gạo là:
\(250.\frac{3}{5}=150\) (tấn)
Số tấn thóc là:
\(250-150=100\)(tấn)
\(Đ\backslash S=...\)