Question

Aflati valoarea lui A:
Ax9+4=670
5xA+5=560
8xA-8=880
63:A+15=22
72:A+13=22
A:6x8=72

Answer 1

Ax9+4=670
9A=670-4
9A=666
A=666:9
A=74
5xA+5=560
5A=560-5
5A=555
A=555:5
A=111
8xA-8=880
8A=880+8
8A=888
A=888:8
A=111
63:A+15=22
63:A=22-15
63:A=7
A=63:7
A=9
72:A+13=22
72:A=22-13
72:A=9
A=72:9
A=8
A:6x8=72
A:6=72:8
A:6=9
A=9x6
A=54

Answer 2

Ax9+4=670                     5xA+5=560                8xA-8=880           63:A+15=22

Ax9=670-4                      5xA=560-5                 8xA=880+8          63:A=22-15

Ax9=666                          5xA=555                     8xA=888             63:A=7 

A=666:9                           A=555:5                       A=888:8              A=63:7

A=74                                   A=111                          A=111              A=9

72:A+13=22                         A:6x8=72

72:A=22-13                          A:6=72:8

72:A=9                                  A:6=9

A=72:9                                   A=6x9

A=8                                          A=54