用简便算法计算: (1)25×32×125 (2)28×1111+9999×8.

问题描述:

用简便算法计算:
(1)25×32×125                         
(2)28×1111+9999×8.

(1)25×32×125,
=(25×4)×(8×125),
=100×1000,
=100000;
(2)28×1111+9999×8,
=28×1111+1111×72,
=(28+72)×1111,
=100×1111,
=111100.