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1, a
2, a
3, an
4, an
5, a
6, an
7, a
8, an
9, a
10, an
11, a
12, a
13, a
14, an
15, an
16, an
17, a
18, a
19,a
20. a
a: =-5/7(2/11+9/11)+12/7
=12/7-5/7
=7/7=1
b: \(=\dfrac{-12}{56}+\dfrac{35}{56}-\dfrac{28}{56}=\dfrac{-5}{56}\)
c: \(=\dfrac{1}{4}-\dfrac{5}{13}+\dfrac{2}{11}-\dfrac{8}{13}+\dfrac{3}{4}\)
=1-1+2/11
=2/11
d: \(=\dfrac{21}{31}+\dfrac{-16}{7}+\dfrac{44}{53}+\dfrac{10}{31}+\dfrac{9}{53}\)
=1+1-16/7
=-2/7
e: \(=\dfrac{\dfrac{4}{36}-\dfrac{30}{36}-\dfrac{144}{36}}{\dfrac{21}{36}-\dfrac{1}{36}-\dfrac{360}{36}}=\dfrac{-160}{-340}=\dfrac{8}{17}\)
\(a,x-\dfrac{3}{4}=\dfrac{1}{7}\\ x=\dfrac{1}{7}+\dfrac{3}{4}\\ x=\dfrac{25}{28}\\ b,x+\dfrac{7}{5}=\dfrac{9}{8}.\dfrac{4}{27}\\ x+\dfrac{7}{5}=\dfrac{1}{6}\\ x=\dfrac{1}{6}-\dfrac{7}{5}\\ x=\dfrac{-37}{30}\\ c,\dfrac{2}{5}-\dfrac{3}{7}=\dfrac{x}{70}\\ \dfrac{-1}{35}=\dfrac{x}{70}\\ \dfrac{-2}{70}=\dfrac{x}{70}\\ x=-2\\ d,\dfrac{2}{9}-\dfrac{7}{8}.x=1\\ \dfrac{7}{8}.x=\dfrac{2}{9}-1\\ \dfrac{7}{8}.x=\dfrac{-7}{9}\\ x=\dfrac{-7}{9}:\dfrac{7}{8}\\ x=\dfrac{-8}{9}\)
\(a,x-\dfrac{3}{4}=\dfrac{1}{7}\)
\(\Rightarrow x=\dfrac{1}{7}+\dfrac{3}{4}\)
\(\Rightarrow x=\dfrac{25}{28}\)
\(b,x+\dfrac{7}{5}=\dfrac{9}{8}.\dfrac{4}{27}\)
\(\Rightarrow x+\dfrac{7}{5}=\dfrac{1}{6}\)
\(\Rightarrow x=\dfrac{1}{6}-\dfrac{7}{5}\)
\(\Rightarrow x=-\dfrac{37}{30}\)
\(c,\dfrac{2}{5}-\dfrac{3}{7}=\dfrac{x}{70}\)
\(\Rightarrow\dfrac{-1}{35}=\dfrac{x}{70}\)
\(\Rightarrow35x=-70\)
\(\Rightarrow x=-2\)
\(d,\dfrac{2}{9}-\dfrac{7}{8}.x=1\)
\(\Rightarrow\dfrac{7}{8}x=\dfrac{2}{9}-1\)
\(\Rightarrow\dfrac{7}{8}x=-\dfrac{7}{9}\)
\(\Rightarrow x=-\dfrac{8}{9}\)
1.Five ten.
2. half past eight
3. nine forty-five
4. a quarter past seven or seven fifteen
5.ten fifty-five
6.eleven o'clock
7.twelve fifty
8.two thirty-five
9.four o'clock
10, six forty
1. 5:10
=> It's five ten
2. 8:30
=> It's half past eight3. 9:45
=> It's a quarter to ten
4. 7:15
=> It's a quarter past seven5. 10:55
=> It's five to eleven6. 11:00
=> It's eleven o'clock7. 12:50
=> It's ten to one8. 2:35
=> It's two thirty-five9. 4:00
=> It's four o'clock10. 6:40
=> It's twenty to seven
1.a desk
2.a pencil
3.a chair
4.a bag
5.an apple
6.a board
7.an earse
8.a waste basket
9.a school
1. Điền vào chỗ trống với a hoặc an:
1. A desk
2. A pencil
3. A chair
4. A bag
5. An apple
6. A board
7. An erase
8. A waste basket
9. A school
2. Đặt câu hỏi với What, dùng các từ ở bài tập 1 để trả lời:
Ví dụ: What's this? - It's a chair.
1. What's this? - It's a desk.
2. What's this? - It's a pencil.
3. What's this? - It's a chair.
4. What's this? - It's a bag.
5. What's this? - It's an apple.
6. What's this? - It's a board.
7. What's this? - It's an erase.
8. What's this? - It's a waste basket.
9. What's this? - It's a school.
viết ra tiếng anh
1. bông hoa flower
2. cái hồ lake
3. đẹp beautiful
4. cánh đồng lúa field
5. 8:00 eight o'clock
6. 9:20 nice twenty
7. 12:10 twelve ten
8. 2:40 two forty
Từ nice viết sai bn nhé!
Sửa lại là nine và cánh đồng lúa phải là paddy field
1:flower
2: lake
3: beautiful
4:rice fields
5:8 o'clock
6: 9 : 20 a.m
7: 12 : 10 a.m
8:2 : 40 a.m
viết ra tiếng anh
1. bông hoa : the flower
2. cái hồ : the lake
3. đẹp : beautiful
4. cánh đồng lúa : the paddy field
5. 8:00 : eight o'clock
6. 9:20 : Nine hours twenty minutes
7. 12:10 : Twelve hours ten minutes
8. 2:40 : Two hours forty minutes
Cho dạng quá khứ các động từ sau:
1. be - was, were
2. have - had
3. take - took
4. play - played
5. study - studied
6. enjoy - enjoied
7. like - liked
8. go - went
9. do - did
10. ride - rode
11. speak - spoke
12. relax - relaxed
CHÚC BẠN HỌC THẬT TỐT!
1) a)\(\frac{6}{12}-\frac{1}{2}+\frac{9}{8}:\frac{1}{2}\)
= \(\frac{6}{12}-\frac{1}{2}+\frac{9}{4}\)
= \(\frac{9}{4}\)
b) \(\frac{5}{6}:\frac{-3}{4}+\frac{1}{2}:\frac{-1}{4}\)
= \(\frac{-10}{9}+\left(-2\right)\)
= \(\frac{-28}{9}\)
c) \(\frac{6}{8}.\frac{-7}{4}-\frac{1}{2}.\frac{-8}{9}\)
= \(\frac{-21}{16}-\frac{-4}{9}\)
= \(\frac{-125}{144}\)
2) a) \(\frac{x}{5}+\frac{1}{3}=\frac{5}{6}\)
=> \(\frac{x}{5}=\frac{5}{6}-\frac{1}{3}\)
=> \(\frac{x}{5}=\frac{1}{2}\)
=> x = \(\frac{5}{2}\)
b) \(\frac{14}{3}-\left(x-\frac{1}{5}\right).2=6\)
=>\(\left(x-\frac{1}{5}\right).2=\frac{14}{3}-6\)
=>\(\left(x-\frac{1}{5}\right).2=\frac{-4}{3}\)
=> \(x-\frac{1}{5}=\frac{-4}{3}:2\)
=> \(x-\frac{1}{5}=\frac{-2}{3}\)
=> \(x=\frac{-2}{3}+\frac{1}{5}\)
=> \(x=\frac{-7}{15}\)
k hộ
#Dii_Army<3
1. 2.
a,9/4 b,-28/9 c,-125/144 a,x=5/2 b,x=-7/15
ko bt đg ko nx.... hì