Помогите решить пример (4 6/7 5/6+8/21) -2 5/13)*8 2/3

(4 6/7 5/6+8/21) -2 5/13)*8 2/3=30 22/495/6+8/21=35/42+16/42=51/424 6/7:51/42=34/7*51/42=867/147=289/49289/49-2 5/13=3757/637-1519/637=2238/6372238/637*8 2/3=2238/637*26/3=1492/49=30 22/49