Răspunsuri

2014-04-06T17:23:32+03:00
A-b=18
a=7b
7b-b=18
6b=18
b=18:6
b=3 
a=7*3
a=21
1 5 1
2014-04-06T17:24:16+03:00
A-b=18
a:b=7
=> a=bx7
bx7-b=18
7b-b=18
6b=18
b=18:6
b=3
a=3x7
a=21