689×99+69的简便运算
来源:学生作业帮助网 编辑:作业帮 时间:2024/05/31 06:30:15
689×99+69的简便运算
689×99+69=689×100-689+69=68900-620=68280
689x99+69
=689x100-698+69
=68900-629
=68271
689x99+99
=689x100
=68900
689×99+69的简便运算
689×99+69=689×100-689+69=68900-620=68280
689x99+69
=689x100-698+69
=68900-629
=68271
689x99+99
=689x100
=68900