设0.17的x包,0.28的y包 0.17x+0.28y=5.00
0.17x=5.00-0.28y
x=(5.00-0.28y)/0.17
通过试算,当y=13时 x=(5.00-0.28×13)/0.17
=(5.00-364)/0.17
=1.36/0.17
=8
0.17的8盒,0.28的13盒