Question

Giải chi tiết giúp mik nha

Answer 1

\(a,2+\dfrac{2}{3}=\dfrac{6}{3}+\dfrac{2}{3}=\dfrac{8}{3}\\ \dfrac{6}{9}-\dfrac{6}{11}=\dfrac{66}{99}-\dfrac{54}{99}=\dfrac{12}{99}=\dfrac{4}{33}\\ b,21\times\dfrac{4}{7}=12\\ \dfrac{54}{30}:\dfrac{6}{5}=\dfrac{9}{5}\times\dfrac{5}{6}=\dfrac{3}{2}\)

Answer 2

a.2+2/3=8/3   ;    6/9-6/11=4/33

b.21x4/7=12  ;   52/30:6/5=52/30x5/6=3/2

Answer 3

a. 8/3, 4/33
b.12, 3/2

Answer 4

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

    \(\dfrac{6}{9}-\dfrac{6}{11}=\dfrac{66}{99}-\dfrac{54}{99}=\dfrac{12}{99}=\dfrac{4}{33}\)

b) \(21\times\dfrac{4}{7}=\dfrac{84}{7}=12\)

  \(\dfrac{54}{30}\div\dfrac{6}{5}=\dfrac{54}{30}\times\dfrac{5}{6}=\dfrac{270}{180}=\dfrac{3}{2}\)

Answer 5

a.2+2/3=8/3   

    6/9-6/11=4/33

b.21x4/7=12 

   52/30:6/5=130/9

Answer 6

8/3

4/33

12

3/2