问题
解答题
方程2x2-3x-2=0的两根是x1,x2,不解方程,求
|
答案
由根与系数的关系得x1+x2=-
=b a
,x1•x2=3 2
=-1,c a
∴
+1 x1
=1 x2
=x2+x1 x1x2
=-3 2 -1
.3 2
方程2x2-3x-2=0的两根是x1,x2,不解方程,求
|
由根与系数的关系得x1+x2=-
=b a
,x1•x2=3 2
=-1,c a
∴
+1 x1
=1 x2
=x2+x1 x1x2
=-3 2 -1
.3 2