Помогите пожалуй все уравнения и напишите верное или не верное пропорция
зарание спасибо

11:2=0,2:0,4     0,5=0,5

2

х:7=9:2                      1:3=х:18                    5:3= t : 6                      5:4= 25 :у

х=(9:2)*7                    1/3=х/18                    5/3= t/6                       1,25=25:у

х=31,5                        1/3 *18=х                  5/3*6=t                         у = 25:1,25

31,5:7=9:2                   х= 18/3                     t=5*2                            у=20

4,5=4,5                        х=6                           t=10                             5:4=25:20

                                     1:3=6:18                  5:3=10:6                      1,25=1,25

                                      1/3=1/3                   1,6=1,6

3

1,8:2=18:20

0,9=0,9

4

2:а=2 цел 1/2 :1 цел 1/4                     х :12=75:15

2:а= 5/2 :5/4                                         х :12= 5

2:а= 5/2 * 4/5                                        х= 5*12

2:а=2                                                     х= 60

а=2:2                                                    60: 12=75:15

а=1                                                       5=5

2:1= 2 цел 1/2 : 1цел 1/4

2=5/2:5/4

2= 5/2 * 4/5

2=2

  12,4:х=5,58:0,9                                    2/3:5/9=х: 1/3

   12,4: х= 6,2                                         2/3* 9/5 =х :1/3

   х= 12,4:6,2                                          6/5= х: 1/3

   х= 2                                                      х= 1/3 * 6/5

  12,4: 2= 5,58:0,9                                   х= 2/5

   6,2=6,2                                                 2/3 :5/9=х:1/3

                                                                2/3*9/5=2/5: 1/3

                                                                 6/5= 2/5*3/1

                                                                 6/5=6/5

5

9/10: 3/5 = 1,2:0,8            

9/10 * 5/3 = 1,5

3/2=1,5

1,5=1,5

6

12,4: х=5,58: 0,9                           4,5 :х= 12,5:4

12,4:х=6,2                                     4,5:х=3,125

х= 12,4 : 6,2                                 х=4,5:3,125 

х=2                                                х= 1,44

12,4 :2= 5,58: 0,9                          4,5:1,44=12,5:4

6,2=6,2                                           3,125=3,125

15:2=х:8                                        3/1= 18/у

0,75=х:8                                       3= 18/у 

х= 8*0,75                                      3=18:у

х=6                                                у= 18:3

15:2=6:8                                        у= 6

7,5 больше 0,75                           3/1= 18/6

15:2 больше х:8                            3= 18:6

                                                         3=3 

где / значит дробь