(3 1/6-4 1/7) • (5 4/5-0,55)
Даю 20б

(3 1/6-4 1/7) • (5 4/5-0,55)=-5,1253 1/6-4 1/7=19/6-29/7=(19*7-29*6)/42==-41/425 4/5-0,55=5,8-0,55=5,25=5 1/4-41/42*5 1/4=-41/42*21/4=(-41*21)/42*4==-41/8=-5,125