九百九十九又九分之八加九十九又九分之八再加九又九分之八再加三分之一怎么简便计算啊?

=九百九十九又九分之八加九十九又九分之八加九又九分之八加九分之三
=九百九十九又九分之八加九分之一加九十九又九分之八加九分之一加九又九分之八加九分之一
=一千加一百加十
=一千一百一十

=999+8/9+99+8/9+9+8/9+1/3
=999+1-1+8/9+99+1-1+8/9+9+1-1+8/9+1/3
=1000-1/9+100-1/9+10-1/9+1/3
=1110-3/9+1/3
=1110-1/3+1/3
=1110

九个九用加减乘除怎么得出九百九十九

九百九十九又九分之八加九十九又九分之八再加九又九分之八再加三分之一
=999+8/9+99+8/9+9+8/9+1/3
=999+1-1+8/9+99+1-1+8/9+9+1-1+8/9+1/3
=1000-1/9+100-1/9+10-1/9+1/3
=1110-3/9+1/3
=1110-1/3+1/3
=1110

999又8/9+99又8/9+9又8/9+1/3
=999又8/9+99又8/9+9又8/9+1/3
=999+99+9+8/9+8/9+8/9+1/3
=999+99+9+8/3+1/3
=999+99+9+3
=1000+100+10-3+3
=1110

九百九十九又九分之八加九十九又九分之八再加九又九分之八再加三分之一
=999+8/9+99+8/9+9+8/9+1/3
=999+99+9+8/9+8/9+8/9+3/9
=999+99+9+8/9+1/9+8/9+1/9+8/9+1/9
=999+99+9+(8/9+1/9)+(8/9+1/9)+(8/9+1/9)
=999+99+9+1+1+1
=999+1+99+1+9+1
=1000+100+10
=1110

我也做不来，来搜搜答案，别人上面列好了，呵呵 ！看不懂