题目内容
用简便方法计算下列各题.
(22+25)×4 | 105×34-5×34 | 103×32 | 99×121. |
分析:(1)根据乘法分配律进行简算;
(2)根据乘法分配律进行简算;
(3)103=100+3,然后再根据乘法分配律进行简算;
(4)99=100-1,然后再根据乘法分配律进行简算.
(2)根据乘法分配律进行简算;
(3)103=100+3,然后再根据乘法分配律进行简算;
(4)99=100-1,然后再根据乘法分配律进行简算.
解答:解:(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.
=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.
点评:完成本题要注意分析式中数据,运用合适的简便方法计算.
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