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a: \(\dfrac{135}{17}+\dfrac{85}{17}+\dfrac{65}{17}+\dfrac{15}{17}\)

\(=\left(\dfrac{135}{17}+\dfrac{65}{17}\right)+\left(\dfrac{85}{17}+\dfrac{15}{17}\right)\)

\(=\dfrac{200}{17}+\dfrac{100}{17}=\dfrac{300}{17}\)

b: Sửa đề: \(\dfrac{446}{200}+\dfrac{32}{200}+\dfrac{554}{200}+\dfrac{968}{200}\)

\(=\dfrac{446+554}{200}+\dfrac{32+968}{200}\)

\(=\dfrac{1000}{200}+\dfrac{1000}{200}\)

=5+5

=10

24 tháng 8 2023

a) \(\dfrac{16}{15}+\dfrac{7}{15}+\dfrac{4}{15}=\left(\dfrac{16}{15}+\dfrac{4}{15}\right)+\dfrac{7}{15}=\dfrac{20}{15}+\dfrac{7}{15}=\dfrac{27}{15}\)

b) \(\dfrac{5}{17}+\dfrac{7}{17}+\dfrac{13}{17}=\dfrac{5}{17}+\left(\dfrac{7}{17}+\dfrac{13}{17}\right)=\dfrac{5}{17}+\dfrac{20}{17}=\dfrac{25}{17}\)

14 tháng 5 2022

\(\dfrac{17}{20}\) x \(\dfrac{27}{13}\) + \(\dfrac{27}{13}\)  x \(\dfrac{3}{20}\)

= (\(\dfrac{17}{20}\)  + \(\dfrac{3}{20}\)) x \(\dfrac{27}{13}\)

= 1 x \(\dfrac{27}{13}\)

=\(\dfrac{27}{13}\)

Tick cho mik nha

2 tháng 4 2022

\(\dfrac{47}{19}:\dfrac{15}{32}-\dfrac{47}{19}:\dfrac{15}{17}\\ =\dfrac{47}{19}\times\dfrac{32}{15}-\dfrac{47}{19}\times\dfrac{17}{15}\\ =\dfrac{47}{19}\times\left(\dfrac{32}{15}-\dfrac{17}{35}\right)\\ =\dfrac{47}{19}\times1\\ =\dfrac{47}{19}\)

`@An`

24 tháng 8 2023

a) \(\dfrac{3}{5}\times\dfrac{17}{21}+\dfrac{2}{5}\times\dfrac{17}{21}\)

\(=\dfrac{17}{21}\times\left(\dfrac{3}{5}+\dfrac{2}{5}\right)\)

\(=\dfrac{17}{21}\times1\)

\(=\dfrac{17}{21}\)

b) \(\dfrac{11}{19}\times\dfrac{2}{7}+\dfrac{5}{7}\times\dfrac{11}{19}\)

\(=\dfrac{11}{19}\times\left(\dfrac{2}{7}+\dfrac{5}{7}\right)\)

\(=\dfrac{11}{19}\times1\)

\(=\dfrac{11}{19}\)

a: =17/21(3/5+2/5)

=17/21*5/5

=17/21

b: =11/19(2/7+5/7)

=11/19*1

=11/19

14 tháng 3 2022

\(=\dfrac{17}{2}+\dfrac{3}{5}\times\left(1+\dfrac{1}{2}+1\right)=\dfrac{17}{2}+\dfrac{3}{5}\times\dfrac{5}{2}=\dfrac{17}{2}+\dfrac{15}{10}=\dfrac{17}{2}+\dfrac{3}{2}=\dfrac{17+3}{2}=\dfrac{20}{2}=10\)

14 tháng 3 2022

\(\dfrac{17}{2}+\dfrac{3}{5}+\dfrac{3}{5}\times\dfrac{1}{2}+\dfrac{3}{5}=\dfrac{17}{2}+\dfrac{3}{5}+\dfrac{3}{10}+\dfrac{3}{5}=\dfrac{85}{10}+\dfrac{6}{10}+\dfrac{3}{10}+\dfrac{6}{10}=10\)

3 tháng 4 2022

a)\(\left(\dfrac{3}{5}+\dfrac{17}{21}\right)^2\)

b)4

3 tháng 4 2022

?

a: =4/5+1/5+2/3+1/3=1+1=2

b: =17/12+7/12+29/7-8/7=3+2=5

c: =3/5+2/5+16/7-1/7-1/7

=1+2=3

d: =2/5+3/5+2/3+1/3+7/4+1/4

=1+1+2

=4

8 tháng 7 2023

thanks

19 tháng 4 2023

a/\(\left(\dfrac{7}{9}\times\dfrac{9}{7}\right)\times\dfrac{25}{28}\)
\(=1\times\dfrac{25}{28}\)
\(=\dfrac{25}{28}\)
b/\(\dfrac{4}{7}\times\dfrac{17}{18}\times\dfrac{7}{4}\times\dfrac{18}{17}\)
\(=\left(\dfrac{4}{7}\times\dfrac{7}{4}\right)\times\left(\dfrac{17}{18}\times\dfrac{18}{17}\right)\)
\(=1\times1\)
\(=1\)

22 tháng 3 2022

..... làm j thế

22 tháng 3 2022

Tính nhanh bạn

24 tháng 8 2023

a) \(\dfrac{21}{23}>\dfrac{19}{23}\)

\(\dfrac{8}{5}=\dfrac{49}{30}\)

\(\dfrac{23}{36}>\dfrac{5}{9}\)

b) \(\dfrac{11}{15}>\dfrac{11}{17}\)

\(\dfrac{26}{13}=2\)

\(3< \dfrac{16}{5}\)

c) \(\dfrac{8}{9}< 1\)

\(1< \dfrac{31}{27}\)

\(\dfrac{8}{9}< \dfrac{31}{27}\)