Решить систему.
[tex] \left \{ {{2(x+y)=40} \atop {xy=51}} ight. [/tex]

2(x+y)=40xy=51-------------x+y=20xy=51-----------x=20-y(20-y).y=51,20y-y²=51,y²-20y+51=0,D=400-204=196,√D=√196=14y1=(20+14)/2=34/2=17, y2=(20-14)/2=6/2=3x1=20-17=3, x2=20-3=17/x,y/=/3,17/ ili /x,y/=/17,3/