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:六六作业网 时间:2024/12/28 22:12:21
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±6425x198=25x(200-2)=25x2

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