Dựa vào các từ cho sẵn, viết thành câu hoàn chỉnh:
1. Ann/ fancy / do / DIY / in her free time.
2. My father/ prefer / not eat / out.
3. Mr. Smith/ love/ go / shopping / at weekend.
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\(B=\left(5-\dfrac{3}{4}+\dfrac{1}{5}\right)-\left(6+\dfrac{7}{4}-\dfrac{8}{5}\right)-\left(2-\dfrac{5}{4}+\dfrac{16}{5}\right)\)
\(=5-\dfrac{3}{4}+\dfrac{1}{5}-6-\dfrac{7}{4}+\dfrac{8}{5}-2+\dfrac{5}{4}-\dfrac{16}{5}\)
\(=\left(5-6-2\right)+\left(-\dfrac{3}{4}-\dfrac{7}{4}+\dfrac{5}{4}\right)+\left(\dfrac{1}{5}+\dfrac{8}{5}-\dfrac{16}{5}\right)\)
\(=-3+\dfrac{-5}{4}+\dfrac{-7}{5}=-3-1,25-1,4=-5,65\)
a) \(\dfrac{-3}{100}>\dfrac{-50}{100}=-\dfrac{1}{2}\)
\(\dfrac{-2}{3}< \dfrac{-1,5}{3}=-\dfrac{1}{2}\)
\(\Rightarrow\dfrac{-3}{100}>\dfrac{-2}{3}\)
b) \(\dfrac{-3}{5}=\dfrac{-9}{15}\)
\(\dfrac{-2}{3}=\dfrac{-10}{15}\)
Mà: - 9 > -10
\(\Rightarrow-\dfrac{9}{15}>\dfrac{-10}{15}\)
hay `-3/5>-2/3`
c) \(\dfrac{-5}{4}< \dfrac{-2}{4}=-\dfrac{1}{2}\)
\(-\dfrac{3}{8}>\dfrac{-4}{8}=-\dfrac{1}{2}\)
\(\Rightarrow-\dfrac{5}{4}< \dfrac{-3}{8}\)
d) \(-\dfrac{2}{3}=\dfrac{1}{3}-1\)
\(-\dfrac{3}{4}=\dfrac{1}{4}-1\)
Vì: `1/3>1/4`
`=>1/3-1>1/4-1`
Hay `-2/3>-3/4`
a: \(\dfrac{-3}{100}=\dfrac{-3\cdot3}{100\cdot3}=\dfrac{-9}{300};\dfrac{2}{-3}=\dfrac{-2}{3}=\dfrac{-2\cdot100}{3\cdot100}=\dfrac{-200}{300}\)
mà -9>-200
nên \(\dfrac{-3}{100}>\dfrac{-2}{3}\)
b: \(\dfrac{-3}{5}=\dfrac{-3\cdot3}{5\cdot3}=\dfrac{-9}{15};\dfrac{2}{-3}=\dfrac{-2}{3}=\dfrac{-2\cdot5}{3\cdot5}=\dfrac{-10}{15}\)
mà -9>-10
nên \(\dfrac{-3}{5}>\dfrac{2}{-3}\)
c: \(\dfrac{-5}{4}=\dfrac{-5\cdot2}{4\cdot2}=\dfrac{-10}{8};\dfrac{-3}{8}=\dfrac{-3}{8}\)
mà -10<-3
nên \(-\dfrac{5}{4}< -\dfrac{3}{8}\)
d: \(\dfrac{-2}{3}=\dfrac{-2\cdot4}{3\cdot4}=\dfrac{-8}{12};\dfrac{3}{-4}=\dfrac{-3}{4}=\dfrac{-3\cdot3}{4\cdot3}=\dfrac{-9}{12}\)
mà -8>-9
nên \(-\dfrac{2}{3}>\dfrac{3}{-4}\)
e: \(\dfrac{267}{-268}=\dfrac{-267}{268}>-1;-1=\dfrac{-1343}{1343}>\dfrac{-1347}{1343}\)
Do đó: \(\dfrac{267}{-268}>\dfrac{-1347}{1343}\)
f: \(\dfrac{2022\cdot2023-1}{2022\cdot2023}=1-\dfrac{1}{2022\cdot2023}\)
\(\dfrac{2023\cdot2024-1}{2023\cdot2024}=1-\dfrac{1}{2023\cdot2024}\)
Ta có: 2022<2024
=>\(2022\cdot2023< 2023\cdot2024\)
=>\(\dfrac{1}{2022\cdot2023}>\dfrac{1}{2023\cdot2024}\)
=>\(-\dfrac{1}{2022\cdot2023}< -\dfrac{1}{2023\cdot2024}\)
=>\(\dfrac{-1}{2022\cdot2023}+1< \dfrac{-1}{2023\cdot2024}+1\)
=>\(\dfrac{2022\cdot2023-1}{2022\cdot2023}< \dfrac{2023\cdot2024-1}{2023\cdot2024}\)
g: \(\dfrac{2022\cdot2023}{2022\cdot2023+1}=1-\dfrac{1}{2022\cdot2023+1}\)
\(\dfrac{2023\cdot2024}{2023\cdot2024+1}=1-\dfrac{1}{2023\cdot2024+1}\)
Vì \(2022\cdot2023+1< 2023\cdot2024+1\)
nên \(\dfrac{1}{2022\cdot2023+1}>\dfrac{1}{2023\cdot2024+1}\)
=>\(\dfrac{-1}{2022\cdot2023+1}< \dfrac{-1}{2023\cdot2024+1}\)
=>\(\dfrac{-1}{2022\cdot2023+1}+1< \dfrac{-1}{2023\cdot2024}+1\)
=>\(\dfrac{2022\cdot2023}{2022\cdot2023+1}< \dfrac{2023\cdot2024}{2023\cdot2024+1}\)
Chọn từ phù hợp nhất để điền vào chỗ trống trong đoạn văn sau
The ao dai the traditional dress of Vietnamese women, has a long history. In the early 17th century. Vietnamese clothing designers (1) _____________ changes to the design of the traditional Chinese costume, creating the early forms of the present ao dai. This creativity showed Vietnam s strong sense (2) _____________ independence. The ao dai, with different designs and materials, was worn by both men and women. Throughout the 21st century, there have been numerous changes in the design of the ao dal: from floral to checked patterns, the use of transparent fabric, the variations in the neck collar, the shortening of the gown's length and different colors of the loose pants. Over the years, (3) _____________ the coining of Western clothing for more convenience in daily activities of modern life, the ao dai has been there to Slay. Therefore. Vietnamese women go on (4) _____________ this unique dress, which is both traditional and fashionable and which (5) _____________ our rich culture to the world.
Câu 1:
A. wore B. made C. became D. did
Câu 2:
A. in B. in C. of D. by
Câu 3:
A. in spite of B. despite of C. because of D. although
Câu 4:
A. wearing B. to wearing C. wear D. worn
Câu 5:
A. creates B. introduces C. improves D. impresses
Chọn từ có phần in đậm phát âm khác với những từ còn lại
Câu 6:
A. get B. news C. lend D. spend
Câu 7:
A. fixes B. watches C. chores D. classes
Câu 8:
A. thank B. mother C. weather D. there
Câu 9:
A. sweet B. write C. wrong D. sword
Câu 10:
A. signed B. handed C. waited D. mended
#\(yGLinh\)
Câu 1:
A. wore B. made C. became D. did
Câu 2:
A. in B. in C. of D. by
Câu 3:
A. in spile of B. despite of C. because of D. although
Câu 4:
A. wearing B. to wearing C. wear D. worn
Câu 5:
A. creates B. introduces C. improves D. impresses
\(\dfrac{2}{3}-\left(-\dfrac{1}{4}\right)+\dfrac{3}{5}-\dfrac{7}{45}-\left(-\dfrac{5}{9}\right)+\dfrac{1}{12}+\dfrac{1}{35}\\ =\dfrac{2}{3}+\dfrac{1}{4}+\dfrac{3}{5}-\dfrac{7}{45}+\dfrac{5}{9}+\dfrac{1}{12}+\dfrac{1}{35}\\ =\left(\dfrac{2}{3}+\dfrac{1}{4}+\dfrac{1}{12}\right)+\left(\dfrac{3}{5}+\dfrac{5}{9}-\dfrac{7}{45}\right)+\dfrac{1}{35}\\ =\left(\dfrac{8}{12}+\dfrac{3}{12}+\dfrac{1}{12}\right)+\left(\dfrac{27}{45}+\dfrac{25}{45}-\dfrac{7}{45}\right)+\dfrac{1}{35}\\ =\dfrac{12}{12}+\dfrac{45}{45}+\dfrac{1}{35}\\ =1+1+\dfrac{1}{35}\\ =2+\dfrac{1}{35}\\ =\dfrac{70}{35}+\dfrac{1}{35}=\dfrac{71}{35}\)
\(\dfrac{2}{3}-\left(-\dfrac{1}{4}\right)+\dfrac{3}{5}-\dfrac{7}{45}-\left(-\dfrac{5}{9}\right)+\dfrac{1}{12}+\dfrac{1}{35}\)
\(=\dfrac{2}{3}+\dfrac{1}{4}+\dfrac{3}{5}-\dfrac{7}{45}+\dfrac{5}{9}+\dfrac{1}{12}+\dfrac{1}{35}\)
\(=\left(\dfrac{2}{3}+\dfrac{1}{4}+\dfrac{1}{12}\right)+\left(\dfrac{3}{5}+\dfrac{1}{35}\right)+\left(-\dfrac{7}{45}+\dfrac{5}{9}\right)\)
\(=\left(\dfrac{8}{12}+\dfrac{3}{12}+\dfrac{1}{12}\right)+\left(\dfrac{21}{35}+\dfrac{1}{35}\right)+\left(-\dfrac{7}{45}+\dfrac{25}{45}\right)\)
\(=1+\dfrac{22}{35}+\dfrac{18}{45}\)
\(=\dfrac{315}{315}+\dfrac{198}{315}+\dfrac{126}{315}\)
\(=\dfrac{71}{35}\)
$1,4$ giờ $\times4+3$ giờ $12$ phút $:6$
$=5,6$ giờ $+3,2$ giờ $:6$
$=5,6$ giờ $+\frac{8}{15}$ giờ
$=5$ giờ $36$ phút + $32$ phút
$=5$ giờ $68$ phút $=6$ giờ $8$ phút
$---$
$1\frac34$ giờ $+2$ giờ $18$ phút $\times 5-1,5$ giờ
$=1,75$ giờ $+2,3$ giờ $\times5-1,5$ giờ
$=(1,75$ giờ $-1,5$ giờ$)+11,5$ giờ
$=0,25$ giờ $+11,5$ giờ
$=11,75$ giờ $= 11$ giờ $45$ phút
1. Mào gà
2. Cái bàn chân
3.Cái miệng
4. Con dơi
5. Cái bóng
6. Con muỗi
7. Cái bút chì
8. Cái cối xay bột
9. Cái giường, cái bàn, cái ghế,...
10. Cái dùi và cái mỏ.
Lời giải:
Vận tốc xuôi dòng: $AB:3$ (km/h)
Vận tốc ngược dòng: $AB:5$ (km/h)
Vì vận tốc xuôi dòng hơn vận tốc ngược dòng 2 lần vận tốc tự nhiên của dòng nước nên vận tốc dòng nước là:
$(AB:3-AB:5):2=\frac{AB}{15}$ (km/h)
Cụm bèo trôi xuôi dòng hết:
$AB: \frac{AB}{15}=15$ (giờ)
1 Ann facies doing DIY in her free time.
2 My father prefers not eating out.
3 Mr. Smith loves going shopping at weekend.
1 Ann fancies doing DIY in her free time
2 My father prefers not eating out
3 Mr Smith loves going shopping at weekend