(1)3*1111*3*1111+1111*9(9999-1111+1)
=9*1111*1111+1111*9(9999-1111+1)
=9*1111(1111+9999-1111+1)=9999*10000=99990000
(2)(2011*10000+2001)/(1991*10000+1997)
=2001(1000+1)/1997(10000+1)=2001/1997
(1)3*1111*3*1111+1111*9(9999-1111+1)
=9*1111*1111+1111*9(9999-1111+1)
=9*1111(1111+9999-1111+1)=9999*10000=99990000
(2)(2011*10000+2001)/(1991*10000+1997)
=2001(1000+1)/1997(10000+1)=2001/1997