问题
解答题
用简便方法计算下列各题.
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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.