Question

помогите решить:
найдите неизвестный член пропорции(483-494).
1) 2 38÷3 16=9,1÷х
2) 3 13÷2 29=1.2÷х

Answer 1

1) 2 3/8 : 3 1/6 = 9,1 : х            2) 3 1/3 : 2 2/9 = 1,2 : х

2 3/8х = 3 1/6 * 9,1                       3 1/3х = 2 2/9 * 1,2

2 3/8х = 19/6 * 91/10                    3 1/3х = 20/9 * 12/10

19/3х = 1729/60                           10/3х = 8/3

х = 1729/60 : 19/3                         х = 8/3 : 10/3

х = 1729/60 * 3/19                         х =  8/3 * 3/10

х = 91/20 = 4 11/20                       х = 8/10

х = 4,55                                         х = 0,8