问题
填空题
若x1,x2方程x2-3x-1=0的两个实数根,则
|
答案
∵x1,x2方程x2-3x-1=0的两个实数根,
∴x1+x2=-
=3,x1x2=-3 1
=-1,-1 1
则
+1 x1
=1 x2
=x1+x2 x1x2
=-3.3 -1
故答案为:-3
若x1,x2方程x2-3x-1=0的两个实数根,则
|
∵x1,x2方程x2-3x-1=0的两个实数根,
∴x1+x2=-
=3,x1x2=-3 1
=-1,-1 1
则
+1 x1
=1 x2
=x1+x2 x1x2
=-3.3 -1
故答案为:-3