(7-1 целых 5/9: 7/24)*1целая 7/20 !

(7-1(5/9)÷(7/24))×1(7/20)=(9/4)=2(1/4)=2,25

1) 1(5/9)÷(7/24)=(14/9)×(24/7)=(7×2×8×3)/(3×3×7)=(2×8)/3=16/3

2) 7-(16/3)=(7×3-16)/3=(21-16)/3=5/3

3) (5/3)×1(7/20)=(5/3)×(27/20)=(5×9×3)/(3×4×5)=9/4=2(1/4)=2,25