I learn English by speaking it everyday

 Mai learns English by reading comic books in her free time

 We learn English because we want to talk with our foreign-friends

 Why does your father learn English?

 My favourite subject is English

 How often do you have English, Mai?

 I have English four times a week

 My sister always watches English cartoon on television

 VD2: a) A=(\(\dfrac{1}{3}\)-\(\dfrac{8}{15}\)-\(\dfrac{1}{7}\))+(\(\dfrac{2}{3}\)+\(\dfrac{-7}{15}\)+1\(\dfrac{1}{7}\))

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

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

              A=              1         -        1      +         1

              A=                          0              +         1

              A=                                           1

 b) B=0,25+\(\dfrac{3}{5}\)-(\(\dfrac{1}{8}\)-\(\dfrac{2}{5}\)+1\(\dfrac{1}{4}\))

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

 Không!

 a) 17,89:25-4,89:25

   =(17,89    -4,89):25

   =           13        :25

   =                 0,52

 b) a là bao nhiêu?

 Chiều cao tương ứng của tam giác đó là:

   224,36∙2:28,4=15,8(cm²)