用简便方法计算:1.4²×9-2.3²×36
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/25 17:43:26
![用简便方法计算:1.4²×9-2.3²×36](/uploads/image/z/132107-59-7.jpg?t=%E7%94%A8%E7%AE%80%E4%BE%BF%E6%96%B9%E6%B3%95%E8%AE%A1%E7%AE%97%3A1.4%26%23178%3B%C3%979-2.3%26%23178%3B%C3%9736)
用简便方法计算:1.4²×9-2.3²×36
用简便方法计算:1.4²×9-2.3²×36
用简便方法计算:1.4²×9-2.3²×36
1.4²×9-2.3²×36
=1.4²×9-2.3²×4x9
=1.4²×9-4.6²×9
=(1.4+4.6)(1.4-4.6)x9
=6x(-3.2)x9
=-172.8
收录互联网各类作业题目,免费共享学生作业习题
大象辅导网手机作业共收录了 千万级 学生作业题目
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/25 17:43:26
用简便方法计算:1.4²×9-2.3²×36
用简便方法计算:1.4²×9-2.3²×36
用简便方法计算:1.4²×9-2.3²×36
1.4²×9-2.3²×36
=1.4²×9-2.3²×4x9
=1.4²×9-4.6²×9
=(1.4+4.6)(1.4-4.6)x9
=6x(-3.2)x9
=-172.8