a,\(\dfrac{3a+1}{ab}\)+\(\dfrac{2a-1}{ab}\)

b,\(\dfrac{3}{2\left(y-1\right)}\)+\(\dfrac{7}{y}\)

đọc hiểu

oral storytelling has been around as long as human language.our ancestors probably gathered around the evening fires and talked about their fears and their beliefs through oral stories this long tradition of storytelling is eviclent in ancient cuitures such as the Australian Aborigines.early story telling probaly 

orignates in simplechant.people sangchants as they worked at grinding corn or shaspeming tools.then they started to combine stories,poetry,music and dance.the stories explained how life began and why thing happenedas well as provicledentain  ment.those who were excellent at storytelling became entartainers,eduators,cultural advisors,and historians for the community.through storytelles,the history of a culturywas handed down from generation.

 In the 20 th century,interest in oral storytelling has revived.a number of storytelling festivals were established.Storytelling festivals bring tellers to gether for entertaining,telling and education in the art

orat= spoken

1,the word''gathered'' in the passagecan be by.............

A,talked    B,met        C,built

2,the phrase ''originates in''in the pussage can be best replaced by...........

A,creates by      B,comes from       C,begins with

3,the word ''excellen'' in the passage is closest in meaning to...............

A,Outstanding       B,brilliant              C,smart

4,the phrase''handed down''in the passage can be best replaced by..........

A,carried out           B,went on      C,passed on

5,the word ''reviad''in the passage can be best replaced by.............

A,come back      B,survied         C,disappeared

hãy tính %khối lượng của các nguyên tố trong hợp chất C₄H₈.