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4×(25×25+25×175)

解:4×(25×25+25×175),
=4×25×25+4×25×175,
=100×25+100×175,
=100×(25+175),
=100×200,
=20000.
分析:通过观察,运用乘法分配律简算.
点评:认真分析数据,选用合适的简便方法计算.
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