` 2/9 xx 29/5 - 4/18 xx 12/10 + 2/9 : 5/22`
` = 2/9 xx 29/5 - 2/9 xx 6/5 + 2/9 xx 22/5`
` = 2/9 xx ( 29/5 - 6/5 + 22/5)`
` = 2/9 xx 45/5`
` = 2/9 xx 9`
` = 18/9`
` = 2`
`2/9xx29/5 - 4/18xx12/10+2/9:5/22`
`=2/9xx29/5-2/9xx6/5+2/9xx22/5`
`=2/9xx(29/5-6/5+22/5)`
`=2/9xx9`
`=2/9xx9/1`
`=18/9=2`