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18 tháng 10 2015

x*4/5:2=6/7      

x*4/5=6/7*2

x*4/5=12/7

x=12/7:4/5

x=15/7

6/5:x:5/4=10/15

6/5:x=10/15*5/4

6/5:x=5/6

x=6/5:5/6

x=36/25

18 tháng 10 2015

b) 6/5 : 5/4 : 10/15 = 0,004

a) 

0.08571428571

`#3107.101107`

a)

\(x\times\dfrac{4}{5}\div2=\dfrac{6}{7}\\x\times\dfrac{2}{5}=\dfrac{6}{7}\\ x=\dfrac{6}{7}\div\dfrac{2}{5}\\ x=\dfrac{15}{7} \)

Vậy, \(x=\dfrac{15}{7}\)

b)

\(\dfrac{6}{5}\div x\div\dfrac{5}{4}=\dfrac{10}{15}\\ \dfrac{24}{25}\div x=\dfrac{10}{15}\\ x=\dfrac{24}{15}\div\dfrac{10}{15}\\ x=\dfrac{36}{25}\)

Vậy, \(x=\dfrac{36}{25}.\)

24 tháng 9 2023

`x xx4/5 :2=6/7`

`x xx 4/5xx1/2=6/7`

`x xx2/5=6/7`

`x=6/7:2/5`

`x=6/7xx5/2`

`x=15/7`

b)

`6/5:x:5/4=10/15`

`6/5:x xx4/5=2/3`

`6/5:x=2/3:4/5`

`6/5:x=2/3xx5/4`

`6/5:x=5/6`

`x=6/5:5/6`

`x=6/5xx6/5`

`x=36/25`

24 tháng 9 2023

a) x × 4/5 : 2 = 6/7

x × 4/5 = 6/7 × 2

x × 4/5 = 12/7

x = 12/7 : 4/5

x = 15/7

b) 6/5 : x : 5/4 = 10/15

6/5 : x : 5/4 = 2/3

6/5 : x = 2/3 × 5/4

6/5 : x = 5/6

x = 6/5 : 5/6

x = 36/25

`4/7 + 2/3 = 12/21 + 14/21 = 26/21`

`5/6 -3/4 = 10/12 - 9/12 = 1/12`

`3/10 xx 15/6 = 3/10 xx 5/2 = 3/4`

`7/6 : 5/4 = 7/6 xx 4/5 = 14/15`

5 tháng 2 2023

`4/7 + 2/3 `

`=12/21 + 14/21`

`=28/21`

`5/6 - 3/4 `

`=20/24 - 18/24`

`=2/24`

`3/10 x 15/6`

`=3/4`

`7/6 : 5/4`

`=7/6 xx 4/5`

`=14/15`

7 tháng 10 2023

\(x\) \(\times\) \(\dfrac{4}{5}\) = 15

\(x\)         = 15 : \(\dfrac{4}{5}\)

\(x\)         = \(\dfrac{75}{4}\) 

7 tháng 10 2023

\(\dfrac{12}{25}\) \(\times\) \(x\) = \(\dfrac{4}{10}\)

          \(x\) = \(\dfrac{4}{10}\) : \(\dfrac{12}{25}\)

          \(x\) = \(\dfrac{5}{6}\) 

19 tháng 10 2020

a)x*4/5:2=6/7               b)6/5:x:5/4=10/15

x*4/5=6/7 x 2                6/5:x=10/15 x 5/4

x*4/5=12/7                     6/5:x=5/6

x=12/7:4/5                       x=6/5:5/6

x=15/7                            x=36/25

19 tháng 10 2020

a) x * 4/5 : 2 = 6/7

x * 4/5 = 6/7 *2

x *4/5        = 12/7

x                = 12/7 : 4/5

x               = 15/7

    Vậy x = 15/7

5 tháng 10 2021

\(x+\dfrac{2}{3}=\dfrac{9}{11}\Rightarrow x=\dfrac{9}{11}-\dfrac{2}{3}=\dfrac{5}{33}\\ x-\dfrac{3}{10}=\dfrac{4}{15}\Rightarrow x=\dfrac{4}{15}+\dfrac{3}{10}=\dfrac{17}{30}\\ x\times\dfrac{1}{7}=\dfrac{5}{6}\Rightarrow x=\dfrac{5}{6}:\dfrac{1}{7}=\dfrac{35}{6}\\ x:\dfrac{3}{5}=\dfrac{1}{6}\Rightarrow x=\dfrac{1}{6}\times\dfrac{3}{5}=\dfrac{1}{10}\)

21 tháng 9 2020

                                                            Bài giải

\(\frac{2}{3}+\frac{3}{4}+\frac{4}{5}=\frac{40}{60}+\frac{45}{60}+\frac{48}{60}=\frac{133}{60}\)

\(\frac{8}{5}+\frac{7}{6}+\frac{10}{9}+\frac{1}{2}=\frac{144}{90}+\frac{105}{90}+\frac{100}{90}+\frac{45}{90}=\frac{394}{90}\)

\(\frac{15}{17}-\frac{11}{13}+\frac{3}{26}=\frac{390}{442}+\frac{374}{442}+\frac{51}{442}=\frac{815}{442}\)

\(\frac{9}{12}\text{ x }\frac{4}{3}\text{ : }\frac{8}{5}=\frac{9}{12}\text{ x }\frac{4}{3}\text{ x }\frac{5}{8}=\frac{9\text{ x }4\text{ x }5}{12\text{ x }3\text{ x }8}=\frac{5}{8}\)

\(\frac{4}{5}\text{ x }\frac{15}{8}\text{ : }\frac{5}{7}=\frac{4}{5}\text{ x }\frac{15}{8}\text{ x }\frac{7}{5}=\frac{4\text{ x }15\text{ x }7}{5\text{ x }8\text{ x }5}=\frac{21}{10}\)

26 tháng 4 2021

\(\frac{2}{3}+\frac{3}{4}+\frac{4}{5}=\frac{40}{60}+\frac{45}{60}+\frac{48}{60}=\frac{133}{60}\) 

\(\frac{8}{5}+\frac{7}{6}+\frac{10}{9}+\frac{1}{2}=\frac{144}{90}+\frac{105}{90}+\frac{100}{90}+\frac{45}{90}=\frac{197}{45}\)

\(\frac{15}{17}-\frac{11}{13}+\frac{1}{26}=\frac{390}{442}+\frac{374}{442}+\frac{51}{442}=\frac{815}{442}\)

\(\frac{9}{12}\times\frac{4}{3}:\frac{8}{5}=1:\frac{8}{5}=\frac{5}{8}\)

\(\frac{4}{5}\times\frac{15}{8}:\frac{5}{7}=\frac{3}{2}:\frac{5}{7}=\frac{21}{10}\)