用简便方法计算. 250×13×4 25×44 3200÷25÷4 99×38+38.

问题描述:

用简便方法计算.
250×13×4             
25×44             
3200÷25÷4             
99×38+38.

250×13×4,
=(250×4)×13,
=1000×13,
=13000;
25×44,
=(25×4)×11,
=100×11,
=1100;
3200÷25÷4,
=3200÷(25×4),
=3200÷100,
=32;
99×38+38,
=(99+1)×38,
=100×38,
=3800.