问题
选择题
若方程x2-3x+1=0的两个实数根为x1,x2,则
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答案
∵方程x2-3x+1=0的两个实数根为x1,x2,
∴x1+x2=-
=3,x1x2=b a
=1c a
则
+1 x1
=1 x2
=x1+x2 x1x2
=3.3 1
故本题选A.
若方程x2-3x+1=0的两个实数根为x1,x2,则
|
∵方程x2-3x+1=0的两个实数根为x1,x2,
∴x1+x2=-
=3,x1x2=b a
=1c a
则
+1 x1
=1 x2
=x1+x2 x1x2
=3.3 1
故本题选A.