7) 8) 9) 10) 11) 12) ПОМОГИТЕ ПОЖАЛУЙСТА СРОЧНО!
7) 2 1/10 * 2 1/7 = 4 70 /70 = 5 8) 4 1/6 * 1 2/5 = 4 2/1 = 6 9) 1 4/7 * 2 6/11 = 2 24/1 = 26 10) 1 1/5 * 2 11/12 = 2 660/60 = 2 11/1 = 13 11) 7 1/2 * 7 1/15 = 49 30/30 = 50 12) 7 5/9 * 1 1/17 = 7 765/153 = 7 5/1 = 12