~ Bạn tham khảo ~
`a, 10000 - 47 xx 74 - 47 xx 26`
`= 10000 - 47 xx ( 74 + 26 )`
`= 10000 - 47 xx 100`
`= 10000 - 4700`
`= 5300`
`b, 3457 - 27xx48 - 48 xx 73 + 6543`
`= ( 3457 + 6543 ) - [48 xx ( 27 + 73 )]`
`= 10000 - [48 xx 100]`
`= 10000 - 4800`
`= 5200`
$#Vịt vàng$