(7/12 - 8/15) + 4/5 × (7/10 - 9/16)

(7/12 - 8/15) + 4/5 × (7/10 - 9/16) = 0,16Приведу дроби к общему знаменателю.1) 7/12 - 8/15 = (7 * 5)/ 60 - (8 * 4)/60 = 35/60 - 32/60 = 3/60 = 1/20;2) 7/10 - 9/16 = (7 * 16 - 9 * 10)/160 = (112 - 90)/160 = 22/160 = 11/80;Сокращу на 4.3) 4/5 * 11/80 = 11/ 100;4) 1/20 + 11/100 = (5 +11)/100 = 16/100 = 0,16.