Question

Answer 1

Bài 1

\(a.=\dfrac{2.9+6.8}{54}=\dfrac{11}{9}\\ b,=\dfrac{7.2+5}{48}=\dfrac{19}{48}\\ c,=\dfrac{4.3+11}{3}\\ =\dfrac{23}{3}\\ d,=\dfrac{31+3.10}{10}\\ =\dfrac{61}{10}\\ \)

Bài 2

\(a,=\dfrac{7.13-6.6}{78}=\dfrac{55}{78}\\ b,=\dfrac{11.9-5-2.4}{36}\\ =\dfrac{43}{18}\\ c,=\dfrac{8.6-15}{6}=\dfrac{11}{2}\\ d,=\dfrac{52-3.17}{17}\\ =\dfrac{1}{17}\)

Answer 2

Bài 1: 

a: 2/6+8/9=1/3+8/9=11/9

b: =14/48+5/48=19/48

c: =12/3+11/3=23/3

d: =31/10+30/10=61/10

Answer 3

Bài 1:

a) \(\dfrac{2}{6}+\dfrac{8}{9}=\dfrac{11}{9}\)

b) \(\dfrac{7}{24}+\dfrac{5}{48}=\dfrac{19}{48}\)

c) \(4+\dfrac{11}{3}=\dfrac{23}{3}\)

d) \(\dfrac{31}{10}+3=\dfrac{61}{10}\)

Bài 2:

a) \(\dfrac{7}{6}-\dfrac{6}{13}=\dfrac{55}{78}\)

b) \(\dfrac{11}{4}-\dfrac{5}{36}-\dfrac{2}{9}=\dfrac{43}{18}\)

c) \(8-\dfrac{15}{6}=\dfrac{11}{2}\)

d) \(\dfrac{52}{17}-3=\dfrac{1}{17}\)

Answer 4

`2/6+ 8/9= 1/3 + 8/9=3/9 + 8/9=11/9`

`7/24 + 5/48= 14/48+5/48=19/48`

`4+11/3= 12/3 + 11/3= 23/3`

`31/10 + 3= 31/10+30/10=61/10`

 

Answer 5