Question

\(\dfrac{2}{3}x\dfrac{20}{21}x\dfrac{3}{2}x\dfrac{7}{5}=\)

 

\(\dfrac{5}{17}x\dfrac{21}{32}x\dfrac{47}{24}x\) 0 =

 

\(\dfrac{11}{3}x\dfrac{26}{7}-\dfrac{26}{7}x\dfrac{8}{3}\)

Answer 1

`(2)/(3)xx(20)/(21)xx(3)/(2)xx(7)/(5)`

`=(2xx20xx3xx7)/(3xx21xx2xx5)`

`=(2xx5xx4xx3xx7)/(3xx3xx7xx2xx5)`

`=(4)/(3)`

``

`(5)/(17)xx(21)/(32)xx(47)/(24)xx0`

`=0`

``

`(11)/(3)xx(26)/(7)-(26)/(7)xx(8)/(3)`

`=(26)/(7)xx((11)/(3)-(8)/(3))`

`=(26)/(7)xx(3)/(3)`

`=(26)/(7)xx1=26/7`

Answer 2

`=40/63 xx  21/10= 4/3`

`= 0` (số nào nhân với `0` cũng bằng `0`)

`= (11/3 - 8/3)xx 26/7= 1 xx 26/7= 26/7`