Bài học: phải có tinh thần lạc quan,biết vươn lên trong khó khăn, thử thách của cuộc sống để đạt tới thành công.

suy nghĩ của người nông dân: con lừa đã già, dù sao thì cái giếng cũng cần được lấp lại và không ích lợi gì trong việc cứu con lừa lên cả. 

suy nghĩ của con lừa:kêu la thảm thiết. lắc mình cho đất rơi xuống và bước chân lên trên. Cứ như vậy, đất đổ xuống, lừa lại bước lên cao hơn.

 a)A=[\(\dfrac{2}{7}\).(\(\dfrac{1}{4}\)-\(\dfrac{1}{3}\))]:[\(\dfrac{2}{7}\).(\(\dfrac{3}{9}\)-\(\dfrac{2}{5}\))]

A=[\(\dfrac{2}{7}\).(\(\dfrac{1}{4}\)-\(\dfrac{1}{3}\))]:[\(\dfrac{2}{7}\).(\(\dfrac{1}{3}\)-\(\dfrac{2}{5}\))]

A=(\(\dfrac{1}{4}\)-\(\dfrac{1}{3}\)):(\(\dfrac{1}{3}\)-\(\dfrac{2}{5}\))

A=\(\dfrac{-1}{12}\):\(\dfrac{-1}{15}\)

A=\(\dfrac{-1}{12}\).\(\dfrac{-15}{1}\)

A=\(\dfrac{5}{4}\)

b)

a)A=\(\dfrac{3}{5}\).\(\dfrac{6}{7}\)+\(\dfrac{3}{7}\).\(\dfrac{3}{5}\)-\(\dfrac{2}{7}\).\(\dfrac{3}{5}\)

A=\(\dfrac{3}{5}\).(\(\dfrac{6}{7}\)+\(\dfrac{3}{7}\)-\(\dfrac{2}{7}\))

A=\(\dfrac{3}{5}\).1

A=\(\dfrac{3}{5}\)

b)B=(-13.\(\dfrac{2}{5}\)+\(\dfrac{-2}{9}\).\(\dfrac{2}{5}\)+\(\dfrac{2}{5}\).\(\dfrac{11}{9}\)).\(\dfrac{5}{2}\)

B=\(\dfrac{2}{5}\).(-13+\(\dfrac{-2}{9}\)+\(\dfrac{11}{9}\)).\(\dfrac{5}{2}\)

B=\(\dfrac{2}{5}\).(-12).\(\dfrac{5}{2}\)

B=\(\dfrac{-24}{5}\).\(\dfrac{5}{2}\)

B=-12

c)C=(\(\dfrac{-4}{5}\)+\(\dfrac{5}{7}\)).\(\dfrac{3}{2}\)+(\(\dfrac{-1}{5}\)+\(^{\dfrac{2}{7}}\)).\(\dfrac{3}{2}\)

C=(\(\dfrac{-4}{5}\)+\(\dfrac{5}{7}\)+\(\dfrac{-1}{5}\)+\(^{\dfrac{2}{7}}\)).\(\dfrac{3}{2}\)

C=[(\(\dfrac{-4}{5}\)+\(\dfrac{-1}{5}\))+(\(\dfrac{5}{7}\)+\(^{\dfrac{2}{7}}\))].\(\dfrac{3}{2}\)

C=[-1+1].\(\dfrac{3}{2}\)

C=0

d)D=\(\dfrac{4}{9}\):[(\(\dfrac{1}{15}\)-\(\dfrac{2}{3}\))+(\(\dfrac{1}{11}\)-\(\dfrac{5}{22}\))]

D=\(\dfrac{4}{9}\):[\(\dfrac{-3}{5}\)+\(\dfrac{-3}{22}\)]

D=\(\dfrac{4}{9}\).[\(\dfrac{-5}{3}\)+\(\dfrac{-22}{3}\)]

D=\(\dfrac{4}{9}\).-9

D=-4

a)

P=\(\dfrac{2}{3}\)+\(\dfrac{1}{4}\)+\(\dfrac{3}{5}\)-\(\dfrac{7}{45}\)+\(\dfrac{5}{9}\)+\(\dfrac{1}{12}\)+\(\dfrac{1}{35}\)

P=(\(\dfrac{2}{3}\)+\(\dfrac{1}{4}\)+\(\dfrac{1}{12}\))+(\(\dfrac{5}{9}\)-\(\dfrac{7}{45}\))+\(\dfrac{3}{5}\)+\(\dfrac{1}{35}\)

P=1+\(\dfrac{2}{5}\)+\(\dfrac{3}{5}\)+\(\dfrac{1}{35}\)

P=1+1+\(\dfrac{1}{35}\)

P=2+\(\dfrac{1}{35}\)=\(\dfrac{71}{35}\)

b)

Q=5-\(\dfrac{3}{4}\)+\(\dfrac{1}{5}\)-6-\(\dfrac{7}{4}\)+\(\dfrac{8}{5}\)-2+\(\dfrac{5}{4}\)-\(\dfrac{16}{5}\)

Q=(5-6-2)+(-\(\dfrac{3}{4}\)-\(\dfrac{7}{4}\)+\(\dfrac{5}{4}\))+(\(\dfrac{1}{5}\)+\(\dfrac{8}{5}\)-\(\dfrac{16}{5}\))

Q=-3+(\(\dfrac{-5}{4}\))+(\(\dfrac{-7}{5}\))

Q=\(-\dfrac{113}{20}\)

a) A=(\(\dfrac{1}{3}\)+\(\dfrac{2}{3}\))-(\(\dfrac{8}{15}\)+\(\dfrac{7}{15}\))+(\(\dfrac{-1}{7}\)+1\(\dfrac{1}{7}\))

A=1-1+1

A=1

b)B=\(\dfrac{1}{4}\)+\(\dfrac{3}{5}\)-(\(\dfrac{1}{8}\)-\(\dfrac{2}{5}\)+\(\dfrac{5}{4}\))

B=\(\dfrac{1}{4}\)+\(\dfrac{3}{5}\)-\(\dfrac{1}{8}\)+\(\dfrac{2}{5}\)-\(\dfrac{5}{4}\)

B=(\(\dfrac{1}{4}\)-\(\dfrac{5}{4}\))+(\(\dfrac{3}{5}\)+\(\dfrac{2}{5}\))-\(\dfrac{1}{8}\)

B=(-1)+1-\(\dfrac{1}{8}\)

B=0-\(\dfrac{1}{8}\)

B=-\(\dfrac{1}{8}\)