[4又9/5-(2又5/2+0.64)+3又25/1+6/5]*4.5
问题描述：
[4又9/5-(2又5/2+0.64)+3又25/1+6/5]*4.5
答
[4又9/5-(2又5/2+0.64)+3又25/1+6/5]*4.5
=[4又9/5+6/5-3.04+3.04]*4.5
=5又18/7*4.5
=5*4.5+18/7*4.5
=22.5+1.75
=24.25