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a) \(\dfrac{2}{5}+\dfrac{2}{3}+\dfrac{3}{4}=\dfrac{24}{60}+\dfrac{40}{60}+\dfrac{45}{60}=\dfrac{24+40+45}{60}=\dfrac{109}{60}\)

b) \(\dfrac{1}{3}+\dfrac{5}{12}+\dfrac{5}{6}=\dfrac{4}{12}+\dfrac{5}{12}+\dfrac{10}{12}=\dfrac{4+5+10}{12}=\dfrac{19}{12}\) 

c) \(\dfrac{1}{6}+\dfrac{5}{24}+\dfrac{2}{3}=\dfrac{4}{24}+\dfrac{5}{24}+\dfrac{16}{24}=\dfrac{4+5+16}{24}=\dfrac{25}{24}\)

24 tháng 1 2022

\(a,\dfrac{2}{5}+\dfrac{2}{3}+\dfrac{3}{4}=\dfrac{109}{60}\)

\(b,\dfrac{1}{3}+\dfrac{5}{12}+\dfrac{5}{6}=\dfrac{19}{12}\)

\(c,\dfrac{1}{6}+\dfrac{5}{24}+\dfrac{2}{3}=\dfrac{25}{24}\)

21 tháng 11 2024

   \(\dfrac{2}{5}+\dfrac{2}{3}+\dfrac{2}{4}\)

\(\dfrac{24}{60}\) + \(\dfrac{40}{60}\) + \(\dfrac{30}{60}\)

\(\dfrac{64}{60}\) + \(\dfrac{30}{60}\)

\(\dfrac{47}{30}\)

\(\dfrac{2}{6}+\dfrac{3}{12}\)

\(\dfrac{4}{12}\) + \(\dfrac{3}{12}\)

\(\dfrac{7}{12}\)

\(\dfrac{5}{6}\) + \(\dfrac{1}{3}\)

\(\dfrac{5}{6}\) + \(\dfrac{2}{6}\)

\(\dfrac{7}{6}\)

 

 

21 tháng 11 2024

   \(\dfrac{1}{3}\) + \(\dfrac{5}{12}\) + \(\dfrac{5}{6}\)

\(\dfrac{4}{12}\) + \(\dfrac{5}{12}\) + \(\dfrac{10}{12}\)

\(\dfrac{9}{12}\) + \(\dfrac{10}{12}\)

\(\dfrac{19}{12}\)

    \(\dfrac{5}{8}\) + \(\dfrac{4}{7}\)

\(\dfrac{35}{56}\) + \(\dfrac{32}{56}\)

=  \(\dfrac{67}{56}\) 

\(\dfrac{7}{3}\) + \(\dfrac{8}{7}\)

\(\dfrac{49}{21}\) + \(\dfrac{24}{21}\)

\(\dfrac{73}{21}\)

   \(\dfrac{1}{5}+\dfrac{5}{35}\)

\(\dfrac{7}{35}\) + \(\dfrac{5}{35}\)

\(\dfrac{12}{35}\) 

27 tháng 2 2023

`a, 4/9 + 2/5 + 5/9= (4/9 +5/9) + 2/5= 1 + 2/5= 5/5 + 2/5= 7/5`

`b, 6/13 + 5/8 + 7/13=(6/13 + 7/13) + 5/8=1+5/8= 8/8 + 5/8= 13/8`

`c, 5/11 + 6/25 + 66/121 = ( 5/11 + 66/121 ) + 6/25=1 + 6/25 = 25/25 + 6/25 = 31/25`

`d, 1/2 + 1/3 + 1/4 + 1/6 + 1/12 + 1/24= (1/2 + 1/4) +(1/3 + 1/6) + (1/12 + 1/24)= 3/4 + 1/2 + 1/8=  6/8 + 4/8 + 1/8= 11/8`

`@ yl`

Chọn D

13 tháng 2 2022

D

12 tháng 2 2018

\(\frac{2}{5}+\frac{2}{3}+\frac{3}{4}\)

\(=\frac{24}{60}+\frac{40}{60}+\frac{45}{60}\)

\(=\frac{24+40+45}{60}\)

\(=\frac{109}{60}\)

11 tháng 2 2018

1. tính

a) \(\frac{2}{5}+\frac{2}{3}+\frac{3}{4}=\frac{24}{60}+\frac{40}{60}+\frac{45}{60}=\frac{64}{60}+\frac{45}{60}=\frac{109}{60}\)

b) \(\frac{1}{3}+\frac{5}{12}+\frac{5}{6}=\frac{4}{12}+\frac{5}{12}+\frac{10}{12}=\frac{9}{12}+\frac{10}{12}=\frac{19}{12}\)

c) \(\frac{1}{6}+\frac{5}{24}+\frac{2}{3}=\frac{4}{24}+\frac{5}{24}+\frac{16}{24}=\frac{9}{24}+\frac{16}{24}=\frac{25}{24}\)

27 tháng 2 2019

A) \(\frac{7}{8}-\frac{5}{12}=\frac{84}{96}-\frac{40}{96}=\frac{44}{96}=\frac{11}{24}\)

B)\(\frac{8}{15}-\frac{2}{5}=\frac{8}{15}-\frac{6}{15}=\frac{2}{15}\)

C)\(\frac{5}{6}-\frac{3}{10}=\frac{50}{60}-\frac{18}{60}=\frac{32}{60}=\frac{8}{15}\)

D)\(\frac{7}{10}-\frac{1}{5}=\frac{7}{10}-\frac{2}{10}=\frac{5}{10}=\frac{1}{2}\)

2)A)\(\frac{5}{10}-\frac{2}{15}=\frac{1}{2}-\frac{2}{15}=\frac{15}{30}-\frac{4}{30}=\frac{11}{30}\)

B)\(\frac{5}{20}-\frac{1}{6}=\frac{1}{4}-\frac{1}{6}=\frac{6}{24}-\frac{4}{24}=\frac{2}{24}=\frac{1}{12}\)

C)\(\frac{6}{18}-\frac{6}{24}=\frac{1}{3}-\frac{1}{4}=\frac{4}{12}-\frac{3}{12}=\frac{1}{12}\)

D)\(\frac{5}{9}-\frac{3}{12}=\frac{5}{9}-\frac{1}{4}=\frac{20}{36}-\frac{9}{36}=\frac{11}{36}\)

Chúc bạn học tốt

18 tháng 2 2022

1.

a, Ta có 28=14⇒14+56=1312(Bn t quy đng lên nhé !)

b,Ta có1216=34⇒18+34=78(Bn t quy đng lên nhé !)

c,Ta có636=16⇒14+16=512(Bn t quy đng lên nhé !)

d,Ta có1218=23⇒23+14=1112(Bn t quy đng lên nhé !)

7.Phn này mk ch cho đáán thuia.67     ;     

 b,420=15     ;         

c,615       ;            

d,129