Lời giải:

$A> \frac{1}{5.6}+\frac{1}{6.7}+\frac{1}{7.8}+...+\frac{1}{100.101}$

$A> \frac{6-5}{5.6}+\frac{7-6}{6.7}+...+\frac{101-100}{100.101}$

$A> \frac{1}{5}-\frac{1}{6}+\frac{1}{6}-\frac{1}{7}+...+\frac{1}{100}-\frac{1}{101}$

$A> \frac{1}{5}-\frac{101}>\frac{1}{6}$

---------------

$A< \frac{1}{4.5}+\frac{1}{5.6}+...+\frac{1}{99.100}$
$A< \frac{1}{4}-\frac{1}{5}+\frac{1}{5}-\frac{1}{6}+...+\frac{1}{99}-\frac{1}{100}$

$A< \frac{1}{4}-\frac{1}{100}< \frac{1}{4}$

hello teacher, my nam i.... (giới thiệu bản thân) 

here, i will talk about my topic: talk about green activities and their benefits to the environment. The first is to plant trees. Trees help absorb Co2 and release gas 02, helping to cool the atmosphere. In addition, it provides shade, fruit and can store a large amount of watter. second, is waste recycling. It helps to treat wastes that pollute the environment, some plastics can even be processed for use. the third, choose green transport like carpooling, bus or bicycle. talking the bus helps reduce a part of emissions into the air, contributing to reducing the greenhouse effect. Cycling can both avoid tracffic jams in the city, improve your health,etc.... Thank you very much. 

activities: plant trees, recycle trash, clean the citiy

NGDHS DJD BCVCN CCD DCNCDN DNVBBV CITY BBVHJ HVVBNC VIE 1-0 THAID LAND VIE WIN NGDF VVNV VMC VFHNF VNCNV BANHFDM FHV JHDƯ VBFNVV VFCVVFND VCVCVNGVHBFDBVV HF  B V B HBHVJ BFBH JHF  JDJBGV DHFHJD  Đ    BH H  HGDHFGDF Đ FG GFHG HGHFFHHFHFFH  DGGHGHGFVB HFHG FFH FHFFG HGFDG H HJDGFJF HDGFHJFDGH DFHJGS ÙGFUBVUGHG BGÙGUVG GBH VG  VH GBGFV   G FDHHFVJF GFKUV BHV BHJGFJ GVBHFG HFGVHDFGBVHGFGVDGVHVGBSDJHGFHDFGHGRFHGFHYGFRGFFRGFHDSGFHSDGFHSGFJSAGAKFÀGKAGRFHYGGFDSGFHRGFFKGDJFGDSKFGKDSFGSKÀGKEGRFYDSRGFHDSFGKDSFGRUGFỦGTEỶGFREYHGFKDSFGẺGRRRR......

66. We might find life on another planet,_____________?

A. might we B. might not we C. might we not D. mightn’t we

66. We might find life on another planet,____might not we_________?

D nhé

Câu hỏi đuôi phải dùng dạng rút gọn nên chọn D

A loại vì vế đầu khẳng

Cu Chi Tunnels, a complex network of underground tunnels were firstly built in the late 1940s during the French colonial period and later were expanded in the early 1960s when the US escalated its military presence in South Vietnam to support a non-Communist regime. Read more about Cu Chi Tunnels here to understand their significant role in the country’s war history.

Câu trên có 2 vế

Trạng ngữ : Mấy chục năm qua

Chủ ngữ 1 : Chiếc áo

Vị ngữ 1 : Còn nguyên như ngày nào 

Mặc dù là quan hệ từ 

Chủ ngữ 2 : Chúng tôi

Vị ngữ 2 : Có nhiều thay đổi

Chúc bn hok tốt !

Cre : Writing to give opinions about topic (Science and technology) Describing people on another planet - Hoc24

Imagine one day , you will be an astronaut who are going to explore the Jupiter and suddenly you meet a alien . Well in my opinion , I think that he or she may be very nice and have a similar figure like in some movies we watch . I think the inhabitants of Jupiter may be very different to human beings. This is how imagine them: They may be much bigger and more powerful than humans. Jupiterians may have eight legs and be able to move very fast. They may have a lot of hair all over their bodies and their skin might be very think so they can live in temperatures of around - 145 degrees Celsius. They may have four eyes and be able to see very far. They may also have a very good sence of smell and they may even be able to sense others’ feelings like happiness or fear. And I don’t think they eat and drink like us. Instead, they get all their energy from the rocks. They may charge their bodies by plugging their feet into the rock, just like charging a battery. That way, they don’t even need to breathe air. The only way they may be similar to us is they live in family units of parents and children. They may also use language to communicate with each other.