Пусть cl — биссектриса треугольника abc, точка x — ее середина, y— проекция x на bc. известно, что ca=3cy. докажите, что треугольник aly— равнобедренный.

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1) 80:   9                   2)70:      60                    3)952:    8         

                                                                         8          119

    72    8                      60         1                        15

ост 8                            ост 10                               8

пров 9*8+8=80     пров  60*1+10=70                        72

                                                                             72

                                                                             0       проверка 119*8=952                                

4)879:  6                                 5)809:    7

   6       146                                 7          115     

   27                                            10

   24                                              7   

    39                                             39

    36                                             35

     3    проверка 146*6+3=879          4  проверка 115*7+4=809

6)  968:      9

     9          107

      6

      0

      68

      63

       5      проверка  107*9+5=968

1) 80:   9                   2)70:      60                    3)952:    8         

                                                                         8          119

    72    8                      60         1                        15

ост 8                            ост 10                               8

пров 9*8+8=80     пров  60*1+10=70                        72

                                                                             72

                                                                             0       проверка 119*8=952                                

4)879:  6                                 5)809:    7

   6       146                                 7          115     

   27                                            10

   24                                              7   

    39                                             39

    36                                             35

     3    проверка 146*6+3=879          4  проверка 115*7+4=809

6)  968:      9

     9          107

      6

      0

      68

      63

       5      проверка  107*9+5=968