问题 解答题
用简便方法计算下列各题.
(22+25)×4105×34-5×34103×3299×121.
答案

(1)(22+25)×4,

=22×4+25×4,

=88+100,

=188;

(2)105×34-5×34,

=(105-5)×34,

=100×34,

=3400;

(3)103×32,

=(100+3)×32,

=100×32+3×32,

=3200+96,

=3296;

(4)99×121,

=(100-1)×121,

=100×121-1×121,

=12100-121,

=11979.

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