9×41+59×39简便方法

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9×41+59×39简便方法9×41+59×39简便方法9×41+59×39简便方法9×41+59×39=9×(100-59)+59×39=900-9×59+59×39=900+(39-9)×59=9

9×41+59×39简便方法
9×41+59×39简便方法

9×41+59×39简便方法
9×41+59×39
=9×(100-59)+59×39
=900-9×59+59×39
=900+(39-9)×59
=900+30×(60-1)
=900+1800-30
=2700-30
=2670