1) x1+x2=-5
2) x1*x2=2
3)a)x1+x2=6
x1*x2=8
x1=4
x2=2
á)x1+x2=1
x1*x2=-20
x1=-4
x2=-5
4) x1+x2=-9
x1-x2=-7
 x1=-8
x2=-17
Âðîäå òàê, ..................................................................................