用简便方法计算55²x5-45²x5

来源：学生作业帮助网编辑：作业帮时间：2024/04/29 16:28:29

用简便方法计算55²x5-45²x5
用简便方法计算55²x5-45²x5

用简便方法计算55²x5-45²x5
55^2x5-45^2x5
=5x(55^2-45^2)
=5x(55+45)x(55-45)
=5x100x10
=5000