(4 целых - 2 целых 5/6 - 5/12)•( 7 целых 1/12 - 5 целых 3/4 Помогите решить!!!

(4-2ц19/12-5/12)•(7ц1/12-5ц9/12); (2ц24/12-2ц10/12-5/12)•(6ц13/12-5ц9/12); 9/12•1ц4/12=9/12•26/12=12/12=1

(4 - 2 5/6-5/12)*(7 1/12-5 3/4)=(2-(5/6+5/12))*(2 1/12-3/4)=( 4-(2 5/6+5/12))* (15/2-23/4)= (4- (34/12+5/12))*(30/4-23/4)= (4- 39/12)*7/4=(4-3 1/4)*7/4= (1-1/4)*   7/4 = 3/4*7/4=21/16=1 5/16