Question

Answer 1

Bài 1.

\(\left(\dfrac{2}{3}-\dfrac{1}{4}\right)\times\dfrac{1}{2}=\dfrac{5}{12}\times\dfrac{1}{2}=\dfrac{5}{24}\)

\(\left(\dfrac{2}{3}-\dfrac{1}{4}\right)\times\dfrac{1}{2}=\dfrac{2}{3}\times\dfrac{1}{2}-\dfrac{1}{4}\times\dfrac{1}{2}=\dfrac{1}{3}-\dfrac{1}{8}=\dfrac{8}{24}-\dfrac{3}{24}=\dfrac{5}{24}\)

 

Bài 2.

\(\dfrac{47}{16}:\dfrac{5}{2}=\dfrac{47}{16}\times\dfrac{2}{5}=\dfrac{94}{80}=\dfrac{47}{40}\)

\(\dfrac{5}{8}:\dfrac{4}{15}=\dfrac{5}{8}\times\dfrac{15}{4}=\dfrac{75}{32}\)

Answer 2

`(2/3-1/4) xx 1/2`

`= (8/12 -3/12) xx 1/2`

`= 5/12 xx 1/2`

`= 5/24`

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`(2/3-1/4) xx 1/2`

`= 2/3 xx 1/2 - 1/4 xx 1/2`

`= 2/6 - 1/8`

`= 1/3 -1/8`

`=5/24`

 

`47/16 : 5/2`

`= 47/16 xx 2/5`

`=47/40`

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`5/8 : 4/15`

`= 5/8 xx 15/4`

`= 75/32`

 

 

Answer 3

\(1.\)

\(\left(\dfrac{2}{3}-\dfrac{1}{4}\right)\times\dfrac{1}{2}=\left(\dfrac{8}{12}-\dfrac{3}{12}\right)\times\dfrac{1}{2}=\dfrac{5}{12}\times\dfrac{1}{2}=\dfrac{5}{24}\)

\(\left(\dfrac{2}{3}-\dfrac{1}{4}\right)\times\dfrac{1}{2}=\left(\dfrac{2}{3}\times\dfrac{1}{2}\right)-\left(\dfrac{1}{4}\times\dfrac{1}{2}\right)=\dfrac{1}{3}-\dfrac{1}{8}=\dfrac{8}{24}-\dfrac{3}{24}=\dfrac{5}{24}\)

\(2.\)

\(\dfrac{47}{16}:\dfrac{5}{2}=\dfrac{47}{16}\times\dfrac{2}{5}=\dfrac{94}{80}=\dfrac{47}{40}\)

\(\dfrac{5}{8}:\dfrac{4}{15}=\dfrac{5}{8}\times\dfrac{15}{4}=\dfrac{75}{32}\)