125*90*72*0.5=405000
4/3*3.14*5.5*5.5*5.5=695
4 /3*3.14*7*7*7 =1432
4/3*3.14*8*8*8=2138
405000/695=582 p>
405000/1432=283
405000/2183=186
These three types of balls are therefore necessary: 582, 283, 186
125*90*72*0.5=405000
4/3*3.14*5.5*5.5*5.5=695
4 /3*3.14*7*7*7 =1432
4/3*3.14*8*8*8=2138
405000/695=582 p>
405000/1432=283
405000/2183=186
These three types of balls are therefore necessary: 582, 283, 186