Đáp án:
`3`
Giải thích các bước giải:
`3 2/15xx2/9xx2 16/19 : 9 2/5 xx 9 1/2 : 2/3`
`=47/15xx2/9xx54/19:47/5xx19/2xx3/2`
`=47/15xx2/9xx54/19xx5/47xx19/2xx3/2`
`=(47xx2xx54xx5xx19xx3)/(15xx9xx19xx47xx2xx2)`
`=(cancel(47)xxcancel(2)xx54xxcancel(15)xxcancel(19))/(cancel(15)xx9xxcancel(19)xxcancel(47)xxcancel(2)xx2)`
`=54/(9xx2)`
`=54/18`
`=3`