25*х= 20200
25х=20200
Х=20200:25
Х=808
21840:d =52
52D=21840
D=21840:52
D=420
30*b=23310
30d=23310
D=23310:30
D=777
25*х= 20200
25х=20200
Х=20200:25
Х=808
21840:d =52
52D=21840
D=21840:52
D=420
30*b=23310
30d=23310
D=23310:30
D=777