15/16 *(24/25 : 9/10) 14/15 : 7/5 * 9/10 4/5*5/6*6/7*7/8 вычислите

15/16 × (24/25 : 9/10) = 15/16 × (24/25 × 10/9) = 15/16 × (8/5 × 2/3) = 15/16 × 16/15 = 1
14/15 : 7/5 × 9/10 = 14/15 × 5/7 × 9/10 = 2/3 × 9/10 = 3/5 = 0,6
4/5 × 5/6 × 6/7 × 7/8 = 1/5 × 4 × 1/2 = 1/5 × 2 = 2/5 = 0,4