问题 解答题

用简便方法计算.

250×13×4

25×44

3200÷25÷4

99×38+38.

答案

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.

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