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25 tháng 8 2021

\(\dfrac{6}{5}+\left(3+\dfrac{-1}{5}\right)\\ =\dfrac{6}{5}+\dfrac{14}{5}\\ =4\)

25 tháng 8 2021

\(\dfrac{6}{5}+\left(3+\dfrac{-1}{5}\right)=\dfrac{6}{5}+3+\dfrac{-1}{5}=\dfrac{6}{5}+\dfrac{15}{5}+\dfrac{-1}{5}=\dfrac{20}{5}=4\)

27 tháng 2 2022

\(\dfrac{-5}{8}-\dfrac{1}{3}+\dfrac{7}{-6}=\dfrac{-5}{8}-\dfrac{1}{3}-\dfrac{7}{6}=\dfrac{-15}{24}-\dfrac{8}{24}-\dfrac{28}{24}=\dfrac{-51}{24}=\dfrac{-17}{8}\)

27 tháng 2 2022

\(\dfrac{-5}{8}-\dfrac{1}{3}+\dfrac{7}{-6}=\dfrac{-17}{8}\)

16 tháng 7 2021

`(6-2 4/5)*3 1/8-1 3/5:1/4`

`=(6-14/5)*25/8-8/5*4`

`=16/5*25/8-32/5`

`=10-32/5=18/5`

13 tháng 2 2022

=(30/5-14/5).25/8.4

=16/5.25/2

=8.5/1.1

=40

 

21 tháng 3 2022

\(a,\dfrac{-8}{15}+\dfrac{13}{30}-\dfrac{5}{12}=\dfrac{-32}{60}+\dfrac{26}{60}-\dfrac{25}{60}=-\dfrac{31}{60}\\ b,\dfrac{3}{2}.\dfrac{7}{2}+\left(\dfrac{-5}{6}+\dfrac{1}{10}:\dfrac{11}{30}\right)=\dfrac{21}{4}+\left(\dfrac{-5}{6}+\dfrac{3}{11}\right)=\dfrac{21}{4}+\dfrac{-37}{66}=\dfrac{619}{132}\)

\(c,\dfrac{-20}{21}.\dfrac{22}{35}+\dfrac{-20}{21}.\dfrac{13}{35}+\dfrac{-22}{21}=\dfrac{-20}{21}\left(\dfrac{22}{35}+\dfrac{13}{35}\right)+\dfrac{-22}{21}=\dfrac{-20}{21}.1+\dfrac{-22}{21}=\dfrac{-20}{21}+\dfrac{-22}{21}=\dfrac{-42}{21}=-2\)

2 tháng 4 2021

a)\(\dfrac{19}{48}-\dfrac{3}{40}=\dfrac{95}{240}-\dfrac{18}{240}=\dfrac{77}{240}\)

b)\(\dfrac{1}{6}+\dfrac{7}{27}+\dfrac{5}{18}=\dfrac{9}{54}+\dfrac{14}{54}+\dfrac{15}{54}=\dfrac{38}{54}=\dfrac{19}{27}\)

2 tháng 4 2021

a) 19/48 - 3/40= 77/240

b) 1/6 + 7/27 + 5/18= 23/54 + 5/18= 19/27

a: \(=\dfrac{3}{4}+\dfrac{9}{5}\cdot\dfrac{2}{3}-1=\dfrac{3}{4}+\dfrac{6}{5}-1=\dfrac{19}{20}\)

b: \(=\dfrac{6}{7}\left(\dfrac{8}{13}+\dfrac{9}{13}-\dfrac{4}{13}\right)=\dfrac{6}{7}\cdot\dfrac{13}{13}=\dfrac{6}{7}\)

22 tháng 2 2022

Thực hiện phép tính ( tính hợ lí nếu được)
a, \(\dfrac{3}{4}+\dfrac{9}{5}:\dfrac{3}{2}-1\)                                         b, \(\dfrac{6}{7}.\dfrac{8}{13}+\dfrac{6}{13}.\dfrac{9}{7}-\dfrac{4}{13}.\dfrac{6}{7}\)
\(\dfrac{3}{4}+\dfrac{6}{5}-1\)                                                 = \(\dfrac{6}{7}.\left(\dfrac{8}{13}+\dfrac{9}{13}-\dfrac{4}{13}\right)\)
\(\dfrac{15}{20}+\dfrac{24}{20}-\dfrac{20}{20}\)                                          = \(\dfrac{6}{7}.\left(\dfrac{17}{13}-\dfrac{4}{13}\right)\)
\(\dfrac{39}{20}-\dfrac{20}{20}\)                                                    = \(\dfrac{6}{7}.1\)
\(\dfrac{19}{20}\)                                                              = \(\dfrac{6}{7}\)

22 tháng 3 2022

\(\dfrac{-13}{18}\)

22 tháng 3 2022


 \(\dfrac{1}{9}\) + \(\dfrac{-5}{6}\)
BCNN (9,6) = 18
18 : 9 = 2  ; 18 : 6 = 3
\(\dfrac{1.2}{9.2}\)\(\dfrac{2}{18}\)  ; \(\dfrac{-5.3}{6.3}\)\(\dfrac{-15}{18}\)
\(\dfrac{2}{18}\) + \(\dfrac{-15}{18}\) = \(\dfrac{2+\left(-15\right)}{18}\)=\(\dfrac{-13}{18}\)

a: \(=\dfrac{14-2+9}{32}\cdot\dfrac{4}{5}=\dfrac{21}{5}\cdot\dfrac{1}{8}=\dfrac{21}{40}\)

b: \(=10+\dfrac{2}{9}+2+\dfrac{3}{5}+6+\dfrac{2}{9}=18+\dfrac{47}{45}=\dfrac{857}{45}\)

c: \(=\dfrac{3}{10}-\dfrac{12}{5}+\dfrac{1}{10}=\dfrac{4}{10}-\dfrac{12}{5}=\dfrac{2}{5}-\dfrac{12}{5}=-2\)

d: \(=\dfrac{-25}{30}\left(\dfrac{37}{44}+\dfrac{13}{44}-\dfrac{6}{44}\right)=\dfrac{-25}{30}\cdot1=-\dfrac{5}{6}\)

26 tháng 2 2022

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a: =11+3/4-6-5/6+4+1/2+1+2/3

=10+9/12-10/12+6/12+8/12

=10+13/12=133/12

b: \(=2+\dfrac{17}{20}-1-\dfrac{11}{15}+2+\dfrac{3}{20}\)

=3-11/15

=34/15

c: \(=\dfrac{31}{7}:\left(\dfrac{7}{5}\cdot\dfrac{31}{7}\right)\)

\(=\dfrac{31}{7}:\dfrac{31}{5}=\dfrac{5}{7}\)

d: \(=\dfrac{29}{8}\cdot\dfrac{36}{29}\cdot\dfrac{15}{23}\cdot\dfrac{23}{5}=\dfrac{9}{2}\cdot3=\dfrac{27}{2}\)