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5 tháng 11 2023

\(4-2\dfrac{1}{3}\)

\(=4-\left(2+\dfrac{1}{3}\right)\)

\(=4-2-\dfrac{1}{3}\)

\(=2-\dfrac{1}{3}\)

\(=\dfrac{5}{3}\)

5 tháng 11 2023

    4 - 2\(\dfrac{1}{3}\)

= 4 -  \(\dfrac{7}{3}\)

\(\dfrac{12}{3}\) - \(\dfrac{7}{3}\)

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

10 tháng 9 2021

\(a,4\dfrac{1}{4}-2=\dfrac{17}{4}-2=\dfrac{9}{4};\dfrac{5}{8}+2\dfrac{3}{5}=\dfrac{5}{8}+\dfrac{13}{5}=\dfrac{129}{40}\\ b,4\dfrac{4}{9}:2=\dfrac{40}{9}\cdot\dfrac{1}{2}=\dfrac{20}{9};\dfrac{2}{3}+3\dfrac{1}{6}=\dfrac{2}{3}+\dfrac{19}{6}=\dfrac{23}{6}\\ c,3\dfrac{1}{5}+2=\dfrac{9}{5}+2=\dfrac{19}{5};\dfrac{3}{5}-2\dfrac{4}{5}=\dfrac{3}{5}-\dfrac{14}{5}=-\dfrac{11}{5}\)

10 tháng 9 2021

\(d,5\dfrac{1}{7}-2=\dfrac{36}{7}-2=\dfrac{22}{7};\dfrac{4}{5}:1\dfrac{1}{5}=\dfrac{4}{5}:\dfrac{6}{5}=\dfrac{2}{3}\\ e,2\dfrac{3}{5}+1=\dfrac{13}{5}+1=\dfrac{18}{5};\dfrac{1}{4}\cdot2\dfrac{2}{3}=\dfrac{1}{4}\cdot\dfrac{8}{3}=\dfrac{2}{3}\\ f,4\dfrac{1}{3}\cdot1=\dfrac{13}{3};\dfrac{1}{2}+5\dfrac{2}{7}=\dfrac{1}{2}+\dfrac{37}{7}=\dfrac{81}{14}\)

28 tháng 3 2020

Tự trả lời nha

4 tháng 11 2023

Bài 1

a) 3 2/5 - 1/2

= 17/5 - 1/2

= 34/10 - 5/10

= 29/10

b) 4/5 + 1/5 × 3/4

= 4/5 + 3/20

= 16/20 + 3/20

= 19/20

c) 3 1/2 × 1 1/7

= 7/2 × 8/7

= 4

d) 4 1/6 : 2 1/3

= 25/6 : 7/3

= 25/14

4 tháng 11 2023

Bài 2

a) 3 × 1/2 + 1/4 × 1/3

= 3/2 + 1/12

= 18/12 + 1/12

= 19/12

b) 1 4/5 - 2/3 : 2 1/3

= 9/5 - 2/3 : 7/3

= 9/5 - 2/7

= 63/35 - 10/35

= 53/35

 

20 tháng 9 2023

a) \(3\dfrac{1}{2}-1\dfrac{1}{4}\times1\dfrac{5}{6}\)

\(=\dfrac{7}{2}-\dfrac{5}{4}\times\dfrac{11}{6}\)

\(=\dfrac{7}{2}-\dfrac{55}{24}\)

\(=\dfrac{84}{24}-\dfrac{55}{24}\)

\(=\dfrac{29}{24}\)

20 tháng 9 2023

b) \(2\dfrac{5}{6}+1\dfrac{2}{3}\div3\dfrac{3}{4}\)

\(=\dfrac{17}{6}+\dfrac{5}{3}\div\dfrac{15}{4}\)

\(=\dfrac{17}{6}+\dfrac{5}{3}\times\dfrac{4}{15}\)

\(=\dfrac{17}{6}+\dfrac{4}{9}\)

\(=\dfrac{153}{54}+\dfrac{24}{54}\)

\(=\dfrac{59}{18}\)

 

21 tháng 9 2021
Giúp mình với
11 tháng 10 2023

   [4\(\dfrac{1}{5}\) - 2\(\dfrac{2}{5}\)] x 8\(\dfrac{5}{6}\)

= [\(\dfrac{21}{5}\) - \(\dfrac{12}{5}\)] x \(\dfrac{53}{6}\)

\(\dfrac{9}{5}\) x \(\dfrac{53}{6}\)

\(\dfrac{159}{10}\)

11 tháng 10 2023

   [5\(\dfrac{1}{3}\) - 2\(\dfrac{2}{3}\)]: \(\dfrac{3}{7}\)

= [\(\dfrac{16}{3}\) - \(\dfrac{8}{3}\)]: \(\dfrac{3}{7}\)

\(\dfrac{8}{3}\) : \(\dfrac{3}{7}\)

\(\dfrac{56}{9}\)

a) \(1\frac{1}{2}+1\frac{1}{3}=\left(1+1\right)\frac{1}{2}+\frac{1}{3}=2+\frac{5}{6}=2\frac{5}{6}\)

b) \(2\frac{2}{3}-1\frac{4}{7}=\left(2-1\right)\frac{2}{3}-\frac{4}{7}=1+\frac{2}{21}=1\frac{2}{21}\)

c) \(2\frac{2}{3}\times5\frac{1}{4}=\frac{8}{3}\times\frac{21}{4}=14\)

d) \(3\frac{1}{2}:2\frac{1}{4}=\frac{7}{2}:\frac{9}{4}=\frac{7}{2}\times\frac{4}{9}=\frac{14}{9}\)

18 tháng 9 2021

a) \(1\frac{1}{2}+1\frac{1}{3}=\frac{3}{2}+\frac{4}{3}=\frac{17}{6}\)

b) \(2\frac{2}{3}-1\frac{4}{7}=\frac{8}{3}-\frac{11}{4}=\frac{23}{21}\)

c) \(2\frac{2}{3}\times5\frac{1}{4}=\frac{8}{3}\times\frac{21}{4}=14\)

d) \(3\frac{1}{2}\div2\frac{1}{4}=\frac{7}{2}\div\frac{9}{4}=\frac{14}{9}\)

8 tháng 9 2017

1:2/5x1/2

=5/2x1/2

=5/4

1/3x2/3-1/4

=2/9-1/4

=-1/36

1/2/3+2/4/5

=5/3+14/5         

=67/15

3/1/2x1/4/5

=7/2x9/5

=63/10

1/4/7-2/3

=11/7-2/3

=19/21