12.5×4.5+4.5×12.5+12.5的简便算法?
来源:学生作业帮助网 编辑:作业帮 时间:2024/05/24 00:33:33
12.5×4.5+4.5×12.5+12.5的简便算法?
12.5×4.5+4.5×12.5+12.5的简便算法?
12.5×4.5+4.5×12.5+12.5的简便算法?
12.5×4.5+4.5×12.5+12.5
=12.5×(4.5+4.5+1)
=12.54×10
=125
把12.5提出来
=12.5x4.5+4.5x12.5+12.5x1
=12.5x(4.5+4.5+1)
=12.5x10
=125
=(4.5+4.5+1)*12.5
=10*12.5
=125