178×99+78的简便计算
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/05 20:33:36
![178×99+78的简便计算](/uploads/image/z/16290-18-0.jpg?t=178%C3%9799%2B78%E7%9A%84%E7%AE%80%E4%BE%BF%E8%AE%A1%E7%AE%97)
178×99+78的简便计算
178×99+78的简便计算
178×99+78的简便计算
178×99+78
=(100+78)×99+78
=100×99+78×99+78
=9900+78×(99+1)
=9900+78×100
=9900+7800
=17700
178×99+78
=(100+78)×99+78
=9900+78×99+78
=9900+78×(99+1)
=9900+7800
=17700
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呵呵 需要楼上这么麻烦?
=178×(100-1)+78
=17800-178+78
=17800-100
=17700
178×99+78
=178×(99+1)-178+78
=17800-178+78
=17622+78
=17700