1/x1+1/x2=(x1+x2)/x1x2=-3/(2*9)=-1/6
0,(2)x^2-1/3x-2=0
x1x2=-2/0,(2)=-9
0,(2)=2/9
x1+x2=(1/3)/(2/9)=1.5
1/x1+1/x2=(x1+x2)/x1x2=-3/(2*9)=-1/6
0,(2)x^2-1/3x-2=0
x1x2=-2/0,(2)=-9
0,(2)=2/9
x1+x2=(1/3)/(2/9)=1.5