$\dfrac{2003 * 1999 - 2003 * 999}{2004 * 999 + 1004}$ Help me câu này nha

`(2003xx1999-2003xx999)/(2004xx999+1004)`

`=(2003xx(1999-999))/((2003+1)xx999+1004)`

`=(1003xx1000)/(2003xx999+(999+1004))`

`=(2003xx1000)/(2003xx999+2003)`

`=(2003xx1000)/(2003xx999+20003xx1)`

`=(2003xx1000)/(2003xx(999+1))`

`= (2003xx1000)/(2003xx1000)`

`=1`

`\text{# Mạc}`