Обратите в десятичные дроби: 9/20,7/40,11/400,21/168,35/280.47/376. с объяснениями!!!! А не просто 9/20 = 0,45

9/20 = (9*5)/(20*5) = 45/100 = 0,457/40 = (7*25)/(40*25) = 175/1000 = 0,17511/400 = (11*25)/(400*25) = 275/10000 = 0,027521/168 = 1/8 = (1*125)/(8*125) = 125/1000 = 0,12535/280 = 1/8 = (1*125)/(8*125) = 125/1000 = 0,12547/376 = 1/8 = (1*125)/(8*125) = 125/1000 = 0,125