(1)(2
-11 9
)×1.6÷(186×3 5
) 1 7
=
×1.6÷23 45
186 7
=
÷184 225
186 7
=
;644 20925
(2)
×67.8+54.3÷19 10
-221×9%1 9
=(67.8+54.3-22.1)×90%
=100×90%
=90;
(3)3333×3333+9999×8889+9
=9999×1111+9999×8889+9
=(1111+8889)×9999+9
=10000×9999+9
=99990000+9
=99990009;
(4)
2011×2011+2011 2012×2012?2012
=
(2011+1)×2011 (2012?1)×2012
=
2012×2011 2011×2012
=1.