20) 18ху ⋅ 2ху³: (3x²у²) при x = 21, y = 3

20) 18ху ⋅ 2ху³: (3x²у²) при x = 21, y = 3

18ху ⋅ 2ху³: (3x²у²) = (18 ⋅ 2) ⋅ (х ⋅ х) ⋅ (у ⋅ у³) : (3x²у²) = 36x²y⁴ : (3x²у²) = (36 : 3) ⋅ (x² : x²) ⋅ (y⁴ : y²) = 12 ⋅ 1 ⋅ y² = 12y²

Подставим значения x = 21, y = 3:

12 ⋅ 3² = 12 ⋅ 9 = 108

Ответ: 108