用简便方法计算:1.4²×9-2.3²×36

来源：学生作业学帮网编辑：学帮网时间：2024/06/01 17:10:05

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