(9又2/7+7又2/9)/(5/7+5/9) 巧算
来源:学生作业学帮网 编辑:学帮网 时间:2024/05/31 11:48:49
(9又2/7+7又2/9)/(5/7+5/9) 巧算
(9又2/7+7又2/9)/(5/7+5/9)
=(65/7+65/9)/(5/7+5/9)
=13*(5/7+5/9)/(5/7+5/9)
=13
(9又2/7+7又2/9)/(5/7+5/9)
=(65/7+65/9)/(5/7+5/9)
=13*(5/7+5/9)/(5/7+5/9)
=13
(9 2/7+7 2/9)/(5/7+5/9)
=(65/7+65/9)/(5/7+5/9)
=13