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21 tháng 2 2022

\(1/5+5/12=37/60 \) (tối giản rồi nhé)

21 tháng 2 2022

\(\dfrac{1}{5}+\dfrac{5}{12}=\dfrac{37}{60}\)

5 tháng 3 2023

A) \(\dfrac{5}{10}-\dfrac{2}{15}\)

\(=\dfrac{1}{2}-\dfrac{2}{15}\)

\(=\dfrac{15}{30}-\dfrac{4}{30}\)

\(=\dfrac{11}{30}\)

B)\(\dfrac{5}{20}-\dfrac{1}{6}\)

\(=\dfrac{1}{4}-\dfrac{1}{6}\)

\(=\dfrac{6}{24}-\dfrac{4}{24}\)

\(=\dfrac{2}{24}=\dfrac{1}{12}\)

C) \(\dfrac{6}{18}-\dfrac{6}{24}\)

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

\(=\dfrac{4}{12}-\dfrac{3}{12}\)

\(=\dfrac{1}{12}\)

D) \(\dfrac{5}{9}-\dfrac{3}{12}\)

\(=\dfrac{5}{9}-\dfrac{1}{4}\)

\(=\dfrac{20}{36}-\dfrac{9}{36}\)

\(=\dfrac{11}{36}\).

a: =1/2-2/15

=15/30-4/30

=11/30

b: =1/4-1/6

=3/12-2/12

=1/12

c: =1/3-1/4

=1/12

d: =20/36-9/36

=11/36

15 tháng 2 2023

a) \(\dfrac{5}{6}-\dfrac{2}{14}\)

\(=\dfrac{5}{6}-\dfrac{1}{7}\)

\(=\dfrac{35}{42}-\dfrac{6}{42}\)

\(=\dfrac{29}{42}\)

b) \(\dfrac{5}{20}-\dfrac{1}{6}\)

\(=\dfrac{1}{4}-\dfrac{1}{6}\)

\(=\dfrac{3}{12}-\dfrac{2}{12}\)

\(=\dfrac{1}{12}\)

c) \(\dfrac{5}{9}-\dfrac{3}{12}\)

\(=\dfrac{5}{9}-\dfrac{1}{4}\)

\(=\dfrac{20}{36}-\dfrac{9}{36}\)

\(=\dfrac{11}{36}\)

d) \(8-\dfrac{4}{6}\)

\(=\dfrac{48}{6}-\dfrac{4}{6}\)

\(=\dfrac{44}{6}=\dfrac{22}{3}\).

4 tháng 3 2022

a) \(\dfrac{16}{24}-\dfrac{1}{3}=\dfrac{2}{3}-\dfrac{1}{3}=\dfrac{1}{3}\)

b ) \(\dfrac{4}{5}-\dfrac{12}{60}=\dfrac{4}{5}-\dfrac{1}{5}=\dfrac{4}{5}\)

c ) \(\dfrac{35}{50}-\dfrac{3}{10}=\dfrac{7}{10}-\dfrac{3}{10}=\dfrac{4}{10}=\dfrac{2}{5}\)

d ) \(\dfrac{21}{28}-\dfrac{1}{4}=\dfrac{3}{4}-\dfrac{1}{4}=\dfrac{2}{4}=\dfrac{1}{2}\)

4 tháng 3 2021

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

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

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

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

20 tháng 2 2023

\(\dfrac{6}{36}+\dfrac{5}{6}=\dfrac{1}{6}+\dfrac{5}{6}=\dfrac{6}{6}=1\\ \dfrac{1}{4}+\dfrac{5}{30}=\dfrac{1}{4}+\dfrac{1}{6}=\dfrac{6}{24}+\dfrac{4}{24}=\dfrac{10}{24}=\dfrac{5}{12}\\ \dfrac{5}{56}+\dfrac{3}{21}=\dfrac{5}{56}+\dfrac{1}{7}=\dfrac{5}{56}+\dfrac{8}{56}=\dfrac{13}{56}\\\dfrac{12}{18}+\dfrac{12}{42}=\dfrac{2}{3}+\dfrac{2}{7}=\dfrac{14}{21}+\dfrac{6}{21}=\dfrac{20}{21} \)

20 tháng 2 2023

6/36 + 5/6=1/6+5/6=6/6=1

1/4 + 5/30=1/4+1/6=6/24+4/24=10/24=5/12

5/56 + 3/21=5/56=1/7=5/56+8/56=13/56

12/18 + 12/42=2/3+2/7=14/21+6/21=20/21

21 tháng 2 2018

16/24-1/3=2/3-1/3=1/3

4/5-12/60=4/5-1/5=3/5

chúc bạn học tốt

21 tháng 2 2018

a, 16/24-1/3=2/3-1/3=1/3

b,4/5-12/60=4/5-1/5=3/5

21 tháng 2 2018

16/24 - 1/3 = 2/3 - 1/3 = 1/3

4/5 - 12/60= 4/5 -1/5 = 3/5

21 tháng 2 2018

mk lk người nhanh nhất nhé

21 tháng 2 2019

\(a)\frac{3}{4}+\frac{1}{3}+\frac{2}{5}=\frac{45+20+24}{60}=\frac{89}{60}\)

\(b)\)Rút gọn rồi tính

\(a)\frac{3}{18}+\frac{4}{7}=\frac{1}{6}+\frac{4}{7}=\frac{7+24}{42}=\frac{31}{42}\)

\(b)\frac{12}{24}+\frac{12}{15}=\frac{1}{2}+\frac{4}{5}=\frac{5+8}{10}=\frac{13}{10}\)

29 tháng 10 2023

\(\dfrac{3}{12}+\dfrac{1}{4}=\dfrac{3:3}{12:3}+\dfrac{1}{4}=\dfrac{1}{4}+\dfrac{1}{4}=\dfrac{2}{4}=\dfrac{1}{2}\)

\(\dfrac{4}{10}+\dfrac{3}{5}=\dfrac{4:2}{10:2}+\dfrac{3}{5}=\dfrac{2}{5}+\dfrac{3}{5}=\dfrac{5}{5}=1\)

\(\dfrac{12}{27}+\dfrac{2}{9}=\dfrac{12:3}{27:3}+\dfrac{2}{9}=\dfrac{4}{9}+\dfrac{2}{9}=\dfrac{6}{9}=\dfrac{2}{3}\)

\(\dfrac{7}{3}+\dfrac{20}{15}=\dfrac{7}{3}+\dfrac{20:5}{15:5}=\dfrac{7}{3}+\dfrac{4}{3}=\dfrac{11}{3}\)