9×41+59×39简便方法
来源:学生作业帮助网 编辑:六六作业网 时间:2024/11/17 17:27:27
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