Giải:

a) \(x-\dfrac{-1}{5}=3+\dfrac{-3}{2}\)

    \(x-\dfrac{-1}{5}=\dfrac{6}{2}+\dfrac{-3}{2}\)

    \(x-\dfrac{-1}{5}=\dfrac{3}{2}\)

    \(x=\dfrac{3}{2}+\dfrac{-1}{5}\)

    \(x=\dfrac{13}{10}\)

\(\text{Vậy }x=\dfrac{13}{10}\)

b) \(3x-\dfrac{5}{6}=\dfrac{-14}{21}:\dfrac{2}{7}\)

    \(3x-\dfrac{5}{6}=\dfrac{-14}{21}.\dfrac{7}{2}\)

    \(3x-\dfrac{5}{6}=\dfrac{-7}{3}\)

    \(3x=\dfrac{-7}{3}+\dfrac{5}{6}\)

    \(3x=\dfrac{-3}{2}\)

    \(x=\dfrac{-3}{2}:3\)

    \(x=\dfrac{-3}{2}.\dfrac{1}{3}\)

    \(x=\dfrac{-1}{2}\)

\(\text{Vậy }x=\dfrac{-1}{2}\)

                                          Giải:

a) \(\left(\dfrac{7}{16}+\dfrac{-1}{8}+\dfrac{9}{32}\right):\dfrac{5}{4}\)

    \(=\left(\dfrac{14}{32}+\dfrac{-4}{32}+\dfrac{9}{32}\right):\dfrac{5}{4}\)

    \(=\dfrac{19}{32}:\dfrac{5}{4}\)

    \(=\dfrac{19}{32}.\dfrac{4}{5}\)

    \(=\dfrac{19}{40}\)

b) \(\dfrac{-3}{8}.\dfrac{1}{2}+\dfrac{1}{6}.\dfrac{-3}{8}+\dfrac{1}{3}.\dfrac{-8}{3}\)

     \(=\dfrac{-3}{8}.\dfrac{1}{2}+\dfrac{1}{6}.\dfrac{-3}{8}+\dfrac{1}{3}.\dfrac{-3}{8}\)

     \(=\dfrac{-3}{8}\left(\dfrac{1}{2}+\dfrac{1}{6}+\dfrac{1}{3}\right)\)

     \(=\dfrac{-3}{8}\left(\dfrac{3}{6}+\dfrac{1}{6}+\dfrac{2}{6}\right)\)

     \(=\dfrac{-3}{8}.1\)

     \(=\dfrac{-3}{8}\)

c) \(\dfrac{\dfrac{-5}{8}.\left(-4\right)^2}{10}\)

     \(=\dfrac{\dfrac{-5}{8}.16}{10}\)

     \(=\dfrac{-10}{10}\)     

     \(=-1\) 

The name of my best friend is Bao. He is my good friend and cares for me a lot. He behaves me well and helps always. I met he in class 6 and became best friend. He is my true friend because she understands me very well and cares for my every need. I like Bao very much. I never had any friend like he ever before. He comes to my home and I too go to his home. Our parents respects us very much and like our friendship. He is so precious for me and I never want to lose he. Whenever I get absent in the classroom, he helps me in doing all the left home works and class works.
He is much similar to me in many aspects. He never argues me and describes me well anything which I get stuck. He is an open minded boy and never feels bad for my misbehave. He is very entertaining in nature and makes me laugh through his interesting jokes and talks in the spare time. He is very attractive, attracts everyone through his smile and nice way of talk. He promotes me always to do better in the classroom and exams. We are good in sports and academic activities. He takes my opinions in his every tough work to do in the right way. We manage to share things in our difficult times. We always perform better in the class tests and main exams.

The name of my best friend is Bao. He is my good friend and cares for me a lot. He behaves me well and helps always. I met he in class 6 and became best friend. He is my true friend because He understands me very well and cares for my every need. I like Bao very much. I never had any friend like he ever before. He comes to my home and I too go to his home. Our parents respects us very much and like our friendship. He is so precious for me and I never want to lose he. Whenever I get absent in the classroom, he helps me in doing all the left home works and class works.
He is much similar to me in many aspects. He never argues me and describes me well anything which I get stuck. He is an open minded boy and never feels bad for my misbehave. He is very entertaining in nature and makes me laugh through his interesting jokes and talks in the spare time. He is very attractive, attracts everyone through his smile and nice way of talk. He promotes me always to do better in the classroom and exams. We are good in sports and academic activities. He takes my opinions in his every tough work to do in the right way. We manage to share things in our difficult times. We always perform better in the class tests and main exams.

C