( 2,04 - 1целая 1/4 ) : 1/20
1)2.04-1.25=0.79 2)(0.79*20) *1=15.8
спс
(2,04-1,25)/0,05=0,79/0,05=15,8 (2 4/100- 1 1/4)/1/20 = (204/100 - 5/4)/ 1/20 = (204/100 - 125/100) / 1/20 = 79/100 / 1/20 = 79/100 * 20/1 = 1580/100 = 15,8