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7/8*4/21=7/21*4/8=1/3*1/2=1/6

5/14*6=30/14=15/7

=>Đề sai rồi bạn

8 tháng 4 2023

Bài 1 : tính 

`A ) 7 / 8  + 5 / 12 = 21/24 + 10/24 = 31/24`                                         

 

`B ) 19 / 15 - 5 / 6 = 38/30 - 25/30 = 13/30 `

 

 

`C ) 8 / 21 xx 14 / 5 =16/15      `                                        

 

 

`D ) 9 / 7 : 3 / 4 = 9/7 xx 4/3 = 12/7`

a, = \(\frac{11}{21}\)\(\left(\frac{7}{4}+\frac{5}{4}\right)\)

   = \(\frac{11}{21}\)x 3

  = \(\frac{33}{21}\)

b) = \(\left(\frac{23}{14}-\frac{9}{14}\right)\)\(\frac{6}{13}\)

    = 1 x \(\frac{6}{13}\)

    = \(\frac{6}{13}\)

21 tháng 5 2021

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24 tháng 5 2022

1.\(\dfrac{8}{11}+\dfrac{8}{33}\times\dfrac{3}{4}=\dfrac{8}{11}+\dfrac{8\times3}{33\times4}=\dfrac{8\times12}{11\times12}+\dfrac{8\times3}{33\times4}=\dfrac{8\times15}{132}=\dfrac{120}{132}=\dfrac{10}{11}\)

2.\(\dfrac{7}{9}\times\dfrac{3}{14}:\dfrac{5}{8}=\dfrac{7}{9}\times\dfrac{3}{14}\times\dfrac{8}{5}=\dfrac{4}{15}\)

3.\(\dfrac{5}{12}-\dfrac{7}{32}:\dfrac{21}{16}=\dfrac{5}{12}-\dfrac{7}{32}\times\dfrac{16}{21}=\dfrac{5}{12}-\dfrac{1}{6}=\dfrac{5-2}{12}=\dfrac{3}{12}=\dfrac{1}{4}\)

`@V.Tr.V`

24 tháng 5 2022

`8/11+8/33xx3/4=8/11+2/11=10/11`

`7/9xx3/14:5/8=7/9xx3/14xx8/5=[7xx3xx4xx2]/[3xx3xx7xx2xx5]=4/[3xx5]=4/15`

`5/12-7/32:21/16=5/12-7/32xx16/21=5/12-2/12=3/12=1/4`

Bài 4: 

a: \(=\dfrac{11}{21}\left(\dfrac{7}{4}+\dfrac{5}{4}\right)=\dfrac{11}{21}\cdot3=\dfrac{11}{7}\)

b: \(=\dfrac{6}{13}\left(\dfrac{23}{14}-\dfrac{9}{14}\right)=\dfrac{6}{13}\)

\(\frac{9}{14}\times\frac{7}{6}=\frac{9\times7}{14\times6}=\frac{3}{4}\)

\(\frac{5}{9}:\frac{10}{21}=\frac{5}{9}\times\frac{21}{10}=\frac{7}{6}\)

\(\frac{8}{15}+\frac{4}{15}:\frac{2}{5}=\frac{8}{15}+\frac{4}{15}\times\frac{5}{2}=\frac{8}{15}+\frac{2}{3}=\frac{8}{15}+\frac{10}{15}=\frac{18}{15}\)

26 tháng 3 2022

a) 10/9

b) 15/8

c) 35/2

d) 72/175

26 tháng 3 2022

b)  2 - 8/9 = 10/9    

c) 5/8 x 3 = 15/8

d) 5 : 6/21= 105/6             

đ) 3/5 x 4/5 x 6/7= 72/175

7 tháng 5 2019

\(a)\frac{7}{25}:\frac{14}{5}+\frac{15}{4}\times\frac{1}{5}\)

\(=\frac{7}{25}\times\frac{5}{14}+\frac{15}{4}\times\frac{1}{5}\)

\(=\frac{1}{10}+\frac{3}{4}\)

\(=\frac{17}{20}\)

\(b)\frac{4}{7}\times\frac{21}{8}-\frac{1}{7}:\frac{14}{5}\)

\(=\frac{4}{7}\times\frac{21}{8}-\frac{1}{7}\times\frac{5}{14}\)

\(=\frac{3}{2}-\frac{5}{98}\)

\(=\frac{71}{49}\)

7 tháng 5 2019

b4/7x21/8-1/7:14/5

=4/7x21/8-1/7x5/14

=84/56-5/98

=3/2-5/98

=71/49

mk giải câu b thôi nha

\(a,\dfrac{4}{5}+\dfrac{2}{7}=\dfrac{28}{35}+\dfrac{10}{35}=\dfrac{38}{35}.\)

\(b,2-\dfrac{8}{9}=\dfrac{18}{9}-\dfrac{8}{9}=\dfrac{10}{9}.\)

\(c,\dfrac{5}{8}\times3=\dfrac{5\times3}{8}=\dfrac{15}{8}.\)

\(d,5:\dfrac{6}{21}=5\times\dfrac{21}{6}=\dfrac{5\times21}{6}=\dfrac{105}{6}=\dfrac{35}{2}.\)

\(đ,\dfrac{3}{5}\times\dfrac{4}{5}\times\dfrac{6}{7}=\dfrac{3\times4\times6}{5\times5\times7}=\dfrac{72}{175}.\)

18 tháng 3 2023

\(a,\dfrac{4}{5}+\dfrac{2}{7}=\dfrac{28}{35}+\dfrac{10}{35}=\dfrac{38}{35}\)

\(b,2-\dfrac{8}{9}=\dfrac{18}{9}-\dfrac{8}{9}=\dfrac{10}{9}\)

\(c,\dfrac{5}{8}\times3=\dfrac{5\times3}{8\times1}=\dfrac{15}{8}\)

\(d,\dfrac{3}{5}\times\dfrac{4}{5}\times\dfrac{6}{7}=\dfrac{3\times4\times6}{5\times5\times7}=\dfrac{72}{175}\)