(x1+x2)/x1x2 =-2/3解方程

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(x1+x2)/x1x2=-2/3解方程(x1+x2)/x1x2=-2/3解方程(x1+x2)/x1x2=-2/3解方程(x2+1)/(x1+1)+(x1+1)/(x2+1)=(x2+

(x1+x2)/x1x2 =-2/3解方程
(x1+x2)/x1x2 =-2/3
解方程

(x1+x2)/x1x2 =-2/3解方程
(x2+1)/(x1+1)+(x1+1)/(x2+1)=(x2+x1x2)/(x1+x1x2)+(x1+x1x2)/(x2+x1x2)=x2(x1+x2)/[x1(x1+x2)]+x1(x1+x2)/[x2(x1+x2)]=x2/x1+x1/x2=(x2^+x1^2)/(x1x2)=[(x1+x2)^2-2x1x2]/(x1x2)=9-2=7