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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: \(=\dfrac{\dfrac{4}{36}-\dfrac{30}{36}-\dfrac{144}{36}}{\dfrac{21}{36}-\dfrac{1}{36}-\dfrac{360}{36}}=\dfrac{-160}{-340}=\dfrac{8}{17}\)
Ta có: 1/22< 1/1.2=1-1/2
1/32<1/2.3=1/2-1/3
..............................
1/1002< 1/99.100=1/99-1/100
Do đó: 1+1/22+1/32+...+1/1002< 1+1-1/2+1/2-1/3+....+1/99-1/100
=> 1+1/22+1/32+....+1/1002<1+1-1/100=2-1/100<2
nên 1+1/22+1/32+....+1/1002<2
Vậy 1+1/22+1/32+...+1/1002<2
- Countable nouns (c): (Danh từ đến được)
apple, egg, sweet
- Uncountable nouns (u): (Danh từ không đến được)
juice, bread, pasta, water, snack
RULES1. With countable nouns, we use a or an and plural forms: an apple / apples, an egg / eggs, a sweet/ sweets.
(Với danh từ đếm được, chúng ta sử dụng a, an, và hình thức số nhiều: một quả táo / những quả táo, một quả trứng / những quả trứng, một viên kẹo / những viên kẹo.)
2. With uncountable nouns, we don’t use a, an and plural forms: juice, bread, pasta, water, snack.
(Với những danh từ không đếm được, chúng ta không sử dụng a, an và hình thức số nhiều: nước ép hoa quả, bánh mì, mì ống, nước, đồ ăn vặt.)
Bai 1 : Viet lai cau sau sao cho nghia ko doi :
61 :I'm the tallest in the class .
- Nobody .in the class is taller than me..
62 : My mother often goes to work by car .
- My mother often ..drives to work .
63 : How much does a bowl of noodles ?(thiếu cost)
What .is the price of a bowl of noodles ?..
61 :I'm the tallest in the class .
- Nobody ..is taller than me in the class.
62 : My mother often goes to work by car .
- My mother often ..gets to work by car.
63 : How much does a bowl of noodles ?
What ..is the price of a bowl of noodles ?.
F1.dùng các từ gợi ý để viết câu hoàn chỉnh ở httd:
1] l/wash/my hair.=> I am washing my hair
2] lt/snow => it is snowing
3] they / sit/on the bench=>they are sitting on the beach
4]lt/rain/very hard =>it is raining very hard
5] she/learn/English=> she is learning english
6]he/listen/to the radio=>he is listening to the radio
7] we/speak/in the claas=>we are speaking in the class
8]l/read/a newspaper..=>i am reading a newspaper
9]you/watch/T.V=>you are watching tv
10]what/sam and annne/ do ?=>what are sam and anne doing?
/s/:students,groups,classmates,thanks,books,streets,desks
/z/:games,beds,days,timetables,floors,greetings,partners,numbers.
/iz/:classes,faces,exercises,pieces,bookcases
VI. Fill in the blanks with the missing words: is, has, or wear(s). And translate the passage into Vietnamese.
Kevin (1) _____is____ short and slim. He (2) _____wears____ glasses and he (3) ____has_____ blue eyes. His hair (4) _____is___ blown and curly.
Tom (5) ____is____ short and slim. He (6) _____wears____ glasses and he (7) _____has____ green eyes. His hair (8) ______is____ long, brown and wavy.
Paul (9) _____is____ tall. He doesn’t (10) _____wear____ glasses. He(11) _____has____brown eyes, and his hair (12) _____is____ brown and curly.
Ben (13) ____is____ short. He (14) _____has____brown eyes and his hair (15) ____is___ long, black and traight.
Kevin (1) ____is_____ short and slim. He (2) ____wears_____ glasses and he (3) ____has_____ blue eyes. His hair (4) __is______ blown and curly.
Tom (5) ___is_____ short and slim. He (6) ____wears_____ glasses and he (7) _____has____ green eyes. His hair (8) ____is______ long, brown and wavy.
Paul (9) ____is_____ tall. He doesn’t (10) ____wear_____ glasses. He(11) ____has_____brown eyes, and his hair (12) ____is_____ brown and curly.
Ben (13) ____is____ short. He (14) ___has______brown eyes and his hair (15) ___is____ long, black and traight.
*Translate into Vietnamese:
Kevin thấp và mảnh khảnh. Anh ấy đeo kính và có đôi mắt xanh dương. Tóc anh ấy phồng và xoăn.
Tom thấp và mảnh khảnh. Anh ấy đeo kính và có đôi mắt xanh lục. Tóc anh ấy dài, màu nâu và gợn sóng.
Paul cao. Anh ấy không đeo kính. Anh ấy có đôi mắt nâu, và tóc anh ấy màu nâu và xoăn.
Ben thấp. Anh ấy có mắt màu nâu và tóc anh ấy dài, đen và thằng.
1 faster
2 thinner
3 larger
4 tired
5 better
6 cleverer
7 shorter
8 earlier
9 happier
10 more carefully
11 more attractive
12 noisier
13 older
14 more interesting
15 wider
16 more independent
17 drier
18 more polluted
19 longer
20 cheaper
Fill in the blank with the mising words: is, has, orwear(s). And translate the passage into Vietnamese.
Kevin (1)______IS__ short and slim. He (2)_______WEARS_ glasses and he (3)___HAS_____ blue eyes. His hair (4)___IS_____ brown and curly.
Tom (5)____IS____ short and slim. He (6)______WEARS__ glasses and he (7)_____HAS___ green eyes. His hair (8)____IS____ long, brown, and wavy.
Paul (9)____IS____ tall. He doesn't (10)______WEAR__ glasses. He (11)______HAS__ brown eyes, and his hair (12)_______IS_ brown and curly.
Ben (13)_____IS___ short. He (14)______HAS__ brown eyes and his hair (15)______IS__ long, black and straight.
1 . is
2. wears
3 . has
4 . is
5 . is
6 . wears
7 . has
8 . is
9 . is
10 . wear
11 . has
12 . is
13 . is
14 . has
15 . is
Chúc bạn học tốt
Bạn xem lời giải của mình nhé:
Giải:
\(S=\frac{1}{5}+\left(\frac{1}{13}+\frac{1}{14}+\frac{1}{15}\right)+\left(\frac{1}{61}+\frac{1}{62}+\frac{1}{63}\right)\\ \frac{1}{13}< \frac{1}{12}\\ \frac{1}{14}< \frac{1}{12}\\ \frac{1}{15}< \frac{1}{12}\\ \frac{1}{61}< \frac{1}{60}\\ \frac{1}{62}< \frac{1}{60}\\ \frac{1}{63}< \frac{1}{60}\)
\(\Rightarrow\frac{1}{5}+\left(\frac{1}{13}+\frac{1}{14}+\frac{1}{15}\right)+\left(\frac{1}{61}+\frac{1}{62}+\frac{1}{63}\right)< \frac{1}{5}+\left(\frac{1}{12}+\frac{1}{12}+\frac{1}{12}\right)+\left(\frac{1}{60}+\frac{1}{60}+\frac{1}{60}\right)\)
\(\Rightarrow A< \frac{1}{5}+\frac{1}{12}.3+\frac{1}{60}.3\\ \Rightarrow A< \frac{1}{5}+\frac{1}{4}+\frac{1}{20}\\ \Rightarrow A< \frac{4+5+1}{20}\\ \Rightarrow A< \frac{1}{2}\left(đpcm\right)\)
Chúc bạn học tốt!
day la toan mak