Решите, умоляю!! (7,1/3-6,7/8):3/4-(5,1/4-4,21/40):1,9/20

Question

Решите, умоляю!! (7,1/3-6,7/8):3/4-(5,1/4-4,21/40):1,9/20

Answer 1

(7,1/3-6,7/8):3/4-(5,1/4-4,21/40):1,9/20=(22/3-55/8)/3/4-(21/4-181/40)/29/20=(176-165)/24)/3/4-((210-181)/40)/29/20=(11/24)/(3/4)/(29/40)/(29/20)=11/24*4/2-29/40*20/29=11/18-1/2=(11-9)/18=2/18=1/9