2 1/4 × 3,25 : 1 1/2 = . . .

2 1/4 ×3,25 ÷ 1 1/2
= 2/4 × 3,25 : 1/2
= 0.5 × 3.25 : 0.5
= 3.25

3,25 → 325/100 = 13/4

2 1/4 x 3,25 : 1 1/2
= 9/4 x 13/4 : 3/2
= 9/4 x 13/4 x 2/3
= 39/8
= 4,875