4 целых 1\2 в квадрате
4²=4*4=9/2*9/2=81/4=20
4 1/2 ⋅ 4 1/2 = 16 1 ⋅ 1/2 ⋅ 2 = 16 1/4
Ответ: 16 целых 1/4