(1)(99³-99)÷98=99(99²-1)÷98=99(99+1)(99-1)÷98=9900
(2)(1-2011²)/2010×1006=(1+2011)(1-2011)/(2011*1006)
=2012*(-2010)/(2010*1006)=-2
(3)57.5²×6-425²×0.06这道题,你输错了是不是
(1)(99³-99)÷98=99(99²-1)÷98=99(99+1)(99-1)÷98=9900
(2)(1-2011²)/2010×1006=(1+2011)(1-2011)/(2011*1006)
=2012*(-2010)/(2010*1006)=-2
(3)57.5²×6-425²×0.06这道题,你输错了是不是