68×57/69+1/69的简便方法?
68×57/69+1/69的简便方法?
日期:2022-03-21 20:01:31 人气:1
68*57/69+1/69
=1/69*(68*57+1)
=1/69*((69-1)*57+1)
=1/69*(69*57-56)
=57-56/69
=57-0.81
=56.19
=1/69*(68*57+1)
=1/69*((69-1)*57+1)
=1/69*(69*57-56)
=57-56/69
=57-0.81
=56.19