算一算:25×198 用简便方法计算:99×64±64
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/06 16:28:40
![算一算:25×198 用简便方法计算:99×64±64](/uploads/image/z/75002-50-2.jpg?t=%E7%AE%97%E4%B8%80%E7%AE%97%EF%BC%9A25%C3%97198+%E7%94%A8%E7%AE%80%E4%BE%BF%E6%96%B9%E6%B3%95%E8%AE%A1%E7%AE%97%EF%BC%9A99%C3%9764%C2%B164)
算一算:25×198 用简便方法计算:99×64±64
算一算:25×198 用简便方法计算:99×64±64
算一算:25×198 用简便方法计算:99×64±64
25x198
=25x(200-2)
=25x200-25x2
=5000-50
=4950;
99x64+64?
=64x(99+1)
=64x100
=6400
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来源:学生作业帮助网 编辑:作业帮 时间:2024/07/06 16:28:40
算一算:25×198 用简便方法计算:99×64±64
算一算:25×198 用简便方法计算:99×64±64
算一算:25×198 用简便方法计算:99×64±64
25x198
=25x(200-2)
=25x200-25x2
=5000-50
=4950;
99x64+64?
=64x(99+1)
=64x100
=6400