Răspunsuri

2014-10-16T22:16:21+03:00
Pai n=1 
Verificare:   (4-1)x(5-1)=12
                    3 x 4=12
2014-10-16T22:17:39+03:00
20-4n-5n-n²=12
n²-9n+18=0
Δ=(-9)²-4*18=9
n1=(9-3)/2=3
n2=(9+3)/2=6
n={3, 6}