решите пожалуйста!!!!!!!!!!!!​

1)

2×9 / 3×4 = 9 / 3×2 = 3/2

(3/2)²=9/4=2,25

2)

4/9 ÷ 16/81 = 4×81 / 9×16 = 81 / 9×4 = 9/4 = 2,25

3)

2×5×14 / 7×12×5 = 5×14 / 7×6×5 = 14 / 7×6 = 2/6 = 1/3

(1/3)²=1/9