Răspunsuri

2014-02-26T16:49:53+02:00
A+3a+a/2+6=987
4a+a/2+6=987
4a+a/2=987-6
4a+a/2=981
amplificam pe 4a cu 2
2*4a/2+a/2=981
8a/2+a/2=981
9a/2=981
9a=981*2
9a=1962
a=1962:9
a=218